Vegetable Alfredo Pasta Bake

Written by Beth - Budget Bytes

Okay, so it’s not really alfredo because it doesn’t even have any cream, but it’s close enough that I’m going to call it that. This fake-out alfredo is a little lighter and doesn’t hit your belly like a ton of bricks. That’s a little more my speed.

This dish reminds me of the white vegetable lasagna that I used to love so much as a kid, except there’s no tedious layering going on. It definitely isn’t one of those quick one-dish meals that we all love so much, but sometimes a little extra time in the kitchen is totally worth it. I used four pots/dishes to make this pasta and I’m not the least bit sorry. How can you be sorry when you have pasta slathered with a creamy sauce and a ton of delicious little vegetables pieces that give every bite a new flavor and texture? You can’t. You just can’t be sorry about dirtying dishes when you have something so great (and I don’t even have a dishwasher, y’all!).

So, choose a day when you have some time and energy to make a masterpiece in the kitchen and make. this. pasta. Cooking can be therapeutic. Turn on some music and enjoy the process just as much as you do the end result.

Vegetable Alfredo Pasta Bake

Top view of a pan of Veggie Alfredo Pasta Bake with wooden spoon

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4.6 from 15 votes

Vegetable Alfredo Pasta Bake

This super creamy yet light Vegetable Alfredo Pasta is loaded with enough vegetables to make your salad jealous. 
Author: Beth - Budget Bytes
Prep Time: 15 mins
Cook Time: 1 hr
Total Time: 1 hr 15 mins
Servings: 8



  • 1 Tbsp olive oil ($0.16)
  • 1 small onion ($0.52)
  • 4 cloves garlic ($0.32)
  • 3 medium carrots ($0.36)
  • 1 medium zucchini ($0.82)
  • 1/2 lb. frozen broccoli & cauliflower pieces ($0.83)
  • 1/4 lb. frozen chopped spinach ($0.41)
  • Salt and pepper to taste ($0.05)


  • 4 Tbsp butter ($0.48)
  • 1/4 cup all-purpose flour ($0.04)
  • 4 cups 2% or whole milk ($1.20)
  • 1/4 tsp ground nutmeg ($0.03)
  • 1/4 tsp garlic powder ($0.03)
  • 1/2 tsp salt ($0.02)
  • Freshly cracked pepper ($0.03)
  • 2/3 cup grated parmesan ($1.09)


  • 1 lb. pasta (elbow, shells, etc.) ($1.50)
  • 1 cup shredded gouda or smoked mozzarella ($1.20)


  • Begin by making the vegetable mix. Dice the onion and mince the garlic. Sauté both in a large skillet with the olive oil over medium heat until soft. Add the frozen broccoli and cauliflower pieces and and the frozen spinach to the skillet. Continue to sauté until the frozen vegetables are warmed through.
  • While the onions, garlic, frozen broccoli, and frozen spinach are cooking, peel and shred the carrots using a large hole cheese grater or box grater. Dice the zucchini into small pieces. Add the carrots and zucchini to the skillet and sauté for one to two minutes more. Season the skillet lightly with salt and pepper. Set the sautéed vegetables aside.
  • Bring a large pot of water to a boil for the pasta. Cook the pasta according to the package directions (boil for 7-10 minutes, or until al dente). Drain the pasta in a colander.
  • While the pasta is cooking, prepare the sauce. Add the butter and flour to a medium sauce pot. Melt the butter over medium heat and use a whisk to incorporate the flour as the butter melts. Allow the flour and butter mixture to begin to bubble. Continue to whisk and cook the mixture for two minutes. If it begins to brown, move on to the next step immediately.
  • Whisk the milk into the butter and flour mixture. Also stir in the nutmeg, garlic powder, salt, and some freshly cracked pepper. Allow the milk to come up to a simmer over medium heat, making sure to whisk frequently to prevent scorching on the bottom. When the milk comes up to a simmer it will begin to thicken.
  • When the sauce is thick enough to coat a spoon, turn the heat down to low and whisk in the parmesan until it is melted and the sauce is thick. Turn the heat off.
  • Preheat the oven to 375 degrees. Return the well drained pasta to the large pot with the heat turned off. Add the sautéed vegetables and the white sauce. Stir until everything is well combined and coated in the sauce. Pour the mixture into a casserole dish that has been coated with non-stick spray. Sprinkle the shredded gouda on top and bake in a preheated 375 degree oven for 30 minutes. Serve hot.
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Serving: 1 ServingCalories: 490.16 kcalCarbohydrates: 58.75 gProtein: 20.13 gFat: 19.58 gSodium: 728.09 mgFiber: 4.09 g
Nutritional values are estimates only. See our full nutrition disclaimer here.

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Top view of three bowls of Vegetable Alfredo Pasta Bake

Step by Step Photos

Fresh Vegetables on counter top

Start by preparing the vegetable mix. For fresh vegetables I used one small onion, four cloves of garlic, three carrots, and one zucchini. You’ll want to cut the onion and zucchini into a small dice, mince the garlic, and shred the carrots with a cheese shredder or box grater. 

Package of Frozen Vegetables and package of frozen spinach

I also used some frozen vegetables because I didn’t want to buy an entire head of cauliflower or a whole bunch of broccoli. Plus this way they’re already chopped. These are both one pound bags, but I used half of the bag of broccoli and cauliflower (“winter blend”) and 1/4 of the bag of spinach. So, that’s 1/2 lb. of broccoli/cauliflower pieces and 1/4 lb. of frozen chopped spinach.

Vegetables, onion and garlic cooking in pan

I began with the onion and garlic. Sauté them in a large skillet with 1 Tbsp olive oil until soft. Then add the 1/2 lb. of frozen broccoli/cauliflower and 1/4 lb. frozen spinach. Continue to sauté until those are warmed through (I did not thaw them first). Use the time while these are cooking to shred the carrots and dice the zucchini.

Reminder of veggies added and mixture continued to cook on stovetop

Add the zucchini and carrots to the skillet and sauté just a couple minutes more. I wanted the vegetables to be slightly crisp still because they will cook a little further in the oven later. Plus, I just like my vegetables to retain a little crunch. Season the skillet with a pinch of salt and pepper. Set the skillet aside while you make the pasta and sauce.

Sauce ingredients in pan with whisk

Start the water for the pasta because that can cook while you’re making the sauce. To make the sauce, add 4 Tbsp of butter and 1/4 cup all-purpose flour to a medium sauce pot. Turn the heat onto medium and whisk the flour and butter together as the butter melts. Let the mixture begin to bubble, then whisk and cook for 2 minutes. This will slightly toast the flour to get rid of that gluey flavor. If the mixture begins to brown, move on to the next step immediately, or you’ll have a brown “white” sauce!

Milk and seasoning added to other sauce ingredients in pan and whisked in

Whisk four cups of milk (2% or higher milkfat). Then whisk in 1/4 tsp nutmeg, 1/4 tsp garlic powder, 1/2 tsp salt, and some freshly cracked pepper. Let the milk come up to a simmer over medium heat, making sure to whisk frequently to keep the bottom from scorching.

Thickened sauce on spoon

When the milk begins to bubble it will also begin to thicken – that’s when those starch granules in the flour plump up and make everything thick. It should get thick enough to coat a spoon like this (oops, I’m focused on the whisk and not the spoon! My bad.). Once you get here, turn the heat down to low.

Parmesan cheese added to sauce mixture in pot

Whisk 2/3 cup grated parmesan into the hot sauce until it is melted. This will further thicken the sauce. It will now coat a spoon a bit thicker! Turn the heat off.

Cooked pasta in colander to drain

By this time your pasta should be finished cooking. Make sure it drains really, really well. You don’t want a bunch of water trapped in the shells to make everything watery. I used this cool shape, but you can use elbows, shells, rotini, or whatever you want. Oh, you’ll want to preheat the oven to 375 now, too.

Cooked pasta and veggies added to pot of sauce

Return the drained pasta to the big pot that it cooked in (heat turned off) and add the prepared vegetables and the sauce. Stir everything really well or until everything is coated in the delicious sauce.

Pasta mixture poured into casserole dish and shredded gouda sprinkled over the top

Pour everything into a casserole dish (this one is about 9×9 inches and it was full up to the top). Sprinkle a cup of shredded gouda (smoked mozzarella would also be nice) on top. Bake in the preheated 375 degree oven for 30 minutes.

Finished dish on stovetop

And then OMG.

Casserole dish of Vegetable Alfredo Pasta Bake with three small bowls served up

Eat it up! It’s so creamy and good with tons of vegetables. Yessss.

Close up of Vegetable Alfredo Pasta Bake

Closer look at the creamy goodness?