Why This Recipe Works

One-Pot Pasta: The noodles cook right in the sauce, soaking up every bit of flavor and saving you an extra pot to wash.
Customizable Toppings: Pepperoni, veggies, or even pineapple—treat the casserole like a blank pizza canvas.
Freezer-Friendly: Assemble, cover, and freeze for up to three months for an instant comfort meal.
Kid-Approved: All the familiar pizza flavors in scoopable form—no floppy crusts to fold or fillings to fall out.
Protein Boost: Cottage cheese whisked into the ricotta adds slow-digesting casein for staying power.
Crispy Edge Guarantee: Baking the final five minutes under broiler creates those coveted browned-cheese ridges.

Ingredients You'll Need

Great casseroles start with great building blocks. Below is the cast of characters that makes this dish sing, plus the swaps I’ve tested when the pantry throws curveballs.

Gluten-Free Penne or Ziti – Choose a corn-rice blend for the sturdiest texture; brown-rice-only pasta can get mushy. Barilla and Jovial are my go-to brands that hold their shape even when baked in acidic tomato sauce.
Italian Sausage – I use mild pork, but turkey or plant-based crumbles work. Remove casings so the meat distributes evenly. If you like heat, add ½ tsp red-pepper flakes.
Low-Sodium Chicken Broth – Using broth instead of water to cook the pasta layers in extra savoriness. Vegetable broth keeps the dish vegetarian.
Crushed Tomatoes – Look for “no calcium chloride” on the label; the additive keeps tomato pieces firm, which we don’t need here. A 28-ounce can plus a 15-ounce can fills a 9×13 dish perfectly.
Ricotta + Small-Curd Cottage Cheese – The duo yields cloud-like creaminess with a protein punch. Lactose-free ricotta is widely available if dairy is a concern.
Mozzarella & Parmesan – Buy blocks and shred yourself. Pre-shredded varieties contain anti-caking starch that can seize under high heat.
Egg – Binds the cheese layer so it doesn’t ooze into the sauce. For an egg-free version, dissolve 1 Tbsp cornstarch in 3 Tbsp milk and warm until thick.
Italian Seasoning & Fresh Basil – Dried herbs go into the sauce for consistent flavor; fresh ribbons finish the bake with brightness.
Pepperoni Slices – Look for “cup & char” style; they curl into tiny bowls of grease that flavor the casserole. Turkey or vegan pepperoni crisp nicely too.

How to Make Gluten Free Pizza Casserole for a Comfort Dinner

Step 1

Preheat & Prep

Move your oven rack to the middle position and preheat to 400 °F (204 °C). Lightly grease a 9×13-inch ceramic or enamel baking dish. The light-colored surface prevents over-browning and lets you monitor cheese color through the oven door.

Step 2

Brown the Sausage

In a large Dutch oven over medium-high heat, add 1 tsp olive oil and the sausage. Break it into pea-size crumbles with a wooden spatula. Cook until no pink remains, 6–7 minutes. Transfer to a small bowl, leaving the flavorful fond behind.

Step 3

Build the Sauce

To the same pot add ½ cup minced onion; sauté 2 minutes until translucent. Stir in 2 cloves minced garlic, 1 tsp Italian seasoning, ½ tsp kosher salt, and ¼ tsp black pepper; toast 30 seconds. Pour in one 28-oz can crushed tomatoes plus 1 cup broth. Bring to a gentle boil, scraping the browned bits.

Step 4

Add Raw Pasta

Stir in 12 oz (about 4 cups) gluten-free penne. Reduce heat to medium-low, cover, and simmer 8 minutes, stirring twice. The pasta will be shy of al dente; that’s perfect because it continues cooking in the oven.

Step 5

Mix Cheese Layer

While the pasta simmers, whisk together 1 cup ricotta, ½ cup cottage cheese, 1 large egg, ¼ cup grated Parmesan, and 2 Tbsp chopped fresh parsley. The mixture should resemble thick cake batter; thin with 1 Tbsp milk only if necessary.

Step 6

Assemble First Layer

Fold the browned sausage back into the pot of pasta-sauce. Taste and adjust salt. Pour half of the mixture into the prepared baking dish and spread level. Dollop half of the cheese mixture overtop; use an offset spatula to gently nudge it toward the edges without fully covering the sauce—this creates pockets of creaminess.

Step 7

Pepperoni & Repeat

Scatter 1 cup shredded low-moisture mozzarella and 20 pepperoni halves over the cheese. Spoon remaining pasta on top, pressing lightly to level. Add the rest of the cheese layer, another cup of mozzarella, and the final 20 pepperoni pieces arranged in neat rows so every slice gets its fair share.

Step 8

Bake to Bubbly

Cover loosely with foil (spray underside with non-stick to prevent cheese stickage). Bake 20 minutes. Remove foil and bake 10 minutes more. Switch oven to broil on high for 2–3 minutes until pepperoni edges crisp and mozzarella forms golden blisters. Rest 10 minutes—this sets the layers for clean scoops.

Expert Tips

Temperature Check

An instant-read thermometer inserted in the center should hit 190 °F—hot enough to fully cook the egg and melt cheeses into silk.

Sauce Consistency

If your crushed tomatoes look watery, simmer uncovered 3 extra minutes to reduce; gluten-free pasta is thirsty but you don’t want soup.

Dairy-Free Swap

Use almond-milk ricotta and vegan mozz shreds; add 1 Tbsp nutritional yeast for umami. The texture will be slightly looser but still luscious.

Make-Ahead Magic

Assemble through Step 7, cover tightly, and refrigerate up to 24 hrs. Add 10 extra minutes to the covered bake time straight from the fridge.

Serving Size

A 9×13 yields 8 generous or 10 modest portions. For potlucks, cut into 16 mini squares; they hold together beautifully at room temp.

Higher Fiber

Sub half the pasta with chickpea-based penne; increase broth by ¼ cup. The extra protein keeps everyone satisfied longer.

Variations to Try

Veggie Supreme: Swap sausage for 2 cups diced bell pepper, mushroom, and zucchini; sauté until moisture evaporates to avoid a watery bake.
Buffalo Chicken: Replace sausage with shredded rotisserie chicken tossed in ¼ cup buffalo sauce; drizzle ranch dressing over each serving.
Margherita Style: Use fresh mozzarella pearls and halved cherry tomatoes; finish with balsamic glaze and chiffonade of basil.
White Pizza: Omit crushed tomatoes and use 2 cups Alfredo sauce plus ½ cup chicken broth; season with roasted garlic and oregano.
Breakfast Bake: Add 4 scrambled eggs and ½ cup cooked bacon crumbles to the cheese layer; serve with maple syrup drizzle for sweet-salty bliss.

Storage Tips

Refrigerate: Cool completely, cover with foil, and store up to 4 days. Individual portions reheat in the microwave in 60–90 seconds with a damp paper towel on top to re-steam the pasta.

Freeze: Portion into freezer-safe 2-cup containers or freeze the entire dish (glass or foil). Wrap first in plastic, then foil, to prevent freezer burn. Thaw overnight in the refrigerator and bake at 350 °F until center reaches 165 °F, 25–30 minutes.

Revive: If the casserole seems dry after thawing, spoon 2 Tbsp broth or tomato juice over each portion before reheating.