Lazy Lasagna Casserole with Ricotta and Mozzarella

This lazy lasagna casserole delivers all the cheesy, meaty satisfaction of classic lasagna without the fuss of boiling noodles or stacking delicate layers for an hour. It borrows the same comforting flavors and turns them into a reliable weeknight meal you can throw together without thinking too hard.

It bakes up bubbly and golden in about half the time, the noodles softening right in the sauce as it cooks. That means less cleanup and more time to sit down and actually enjoy dinner.

Why This Casserole Works

The ricotta layer stays creamy, and the top gets that irresistible browned cheese pull. It tastes like lasagna but comes together faster, which is exactly what a busy Tuesday night asks for.

I keep coming back to this recipe because it feeds a crowd with minimal effort, and leftovers taste even better the next day. You don’t have to boil a single noodle, and that alone makes it a permanent part of my rotation.

Ingredients

• 1 tbsp olive oil: just enough to brown the meat.
• 1 lb ground beef: lean but not extra-lean, for flavor.
• 1 medium yellow onion: diced small.
• 2 cloves garlic: minced.
• 1 tsp Italian seasoning: dried, or substitute 1 tsp dried oregano plus 1/2 tsp dried basil.
• 24 oz marinara sauce: a good jarred sauce you already know you like.
• 15 oz ricotta cheese: whole milk for the creamiest layer.
• 1 large egg: helps the ricotta set up softly.
• 1/2 cup grated Parmesan: plus a little more for the top.
• 2 cups shredded mozzarella: whole-milk if possible, for stretch.
• 6 no-boil lasagna noodles: the wide, flat kind; they soften in the oven.
• Kosher salt and black pepper: season as you go.
• Fresh basil leaves: for serving.

Variations / Substitutions

• Ground turkey or Italian sausage: swap in mild or spicy Italian sausage for more flavor, or ground turkey if you prefer a lighter protein.
• Dairy-free: use dairy-free ricotta, mozzarella, and Parmesan alternatives. Choose a creamy dairy-free ricotta so the layer stays moist.
• Extra spice: stir a pinch of red pepper flakes into the meat sauce or sprinkle on top before baking.
• Fresh herbs instead of dried: fold chopped fresh oregano or basil into the ricotta for a brighter finish.

If you are in the mood for a from-scratch classic, our Best Homemade Lasagna hits the same notes with a traditional boil-and-layer method.

How to Make Lazy Lasagna Casserole

Step 1: Brown the Meat and Onion

Preheat your oven to 375°F (190°C). Set a large skillet over medium-high heat and add the 1 tbsp olive oil. Once it shimmers, crumble in the 1 lb ground beef and scatter in the diced onion. Cook for about 6 to 7 minutes, breaking the meat apart with a spatula, until the beef loses its pink color and the onion turns translucent.

Stir in the 2 minced garlic cloves and the 1 tsp Italian seasoning, and let them sizzle for about 30 seconds until fragrant. Season with a pinch of salt and pepper. Drain off any excess fat, then pour in the 24 oz marinara sauce, stir everything together, and take the pan off the heat.

Step 2: Mix the Ricotta Filling

In a medium bowl, combine the 15 oz ricotta, the 1 large egg, the 1/2 cup grated Parmesan, and a good pinch of salt and a few cracks of black pepper. Stir vigorously until the mixture is smooth and the egg is completely blended in.

You are looking for a uniform, spreadable filling with no streaks of egg white. Taste it at this point and adjust the salt if needed, it seasons the whole casserole.

Step 3: Layer the Casserole

Spread a thin layer of the meat sauce across the bottom of a 9×13-inch baking dish, just enough to cover the surface. Arrange 3 no-boil lasagna noodles in a single layer on top, breaking them if needed to fit.

Spoon half the ricotta mixture over the noodles and gently spread it around. Sprinkle with about a third of the mozzarella, then spoon on half the remaining meat sauce. Add the other 3 noodles, spread the rest of the ricotta, another third of the mozzarella, and finish with the last of the meat sauce. Top with the remaining mozzarella and, if you like, an extra dusting of Parmesan.

Step 4: Bake Until Bubbly and Golden

Cover the dish loosely with foil tented so it does not stick to the cheese, and slide it into the hot oven. Bake for 25 minutes, then remove the foil and bake another 10 to 12 minutes, until the whole thing is bubbling and the cheese on top is deep golden in spots.

If the top needs a little more color, switch the broiler to high for the last 1 to 2 minutes. Watch it carefully so it browns without burning.

Step 5: Slice and Serve

Let the casserole rest on the counter for 10 minutes. That short wait lets the layers set so you can cut neat squares. Slice into portions and serve it warm, scattered with fresh basil leaves.

The cheese strings when you pull the first scoop, and the noodles are tender but still hold their shape. That first bite is exactly what you want from a lazy lasagna.

A Few Tips for the Best Casserole

• Use a sauce you love: The marinara carries the whole dish, so reach for a jar you already know tastes great.
• Cover every noodle: Make sure each no-boil noodle is fully pressed into sauce. Dry edges will stay hard even after baking.
• Broil for color: Browning the top under the broiler for a minute or two gives you that crisp, golden cheese layer without overcooking the casserole.
• Assemble ahead: You can layer everything in the dish, cover, and refrigerate up to 24 hours. Add 5 to 7 minutes to the bake time when you cook it cold.

Bake times can shift slightly with dish size. Use this guide if you are scaling up or down.

Storing and Reheating Leftovers

• Refrigerate: Keep leftovers in an airtight container in the fridge for up to 4 days. The slices hold together well once chilled.
• Reheating: Reheat individual portions in the microwave, or warm larger pieces in a 350°F oven until heated through. Cover with foil to keep the cheese from drying out.
• Freeze: Wrap the cooled casserole tightly and freeze it whole for up to 2 months. Thaw overnight in the fridge before reheating.

What to Serve with This Casserole

A simple green salad with a sharp vinaigrette cuts through the richness nicely. Garlic bread or thick slices of toasted ciabatta are great for scooping up any leftover sauce on the plate. Both add crunch and keep the meal feeling balanced.

Frequently Asked Questions

Can I use cottage cheese instead of ricotta?

Yes, but drain it first in a fine-mesh sieve so the casserole does not turn watery. Blended cottage cheese gives you a smoother texture close to ricotta.

Can I make this vegetarian?

Absolutely. Replace the ground beef with sautéed mushrooms, lentils, or a plant-based ground meat alternative. Keep the rest of the recipe the same.

Do I have to use no-boil noodles?

For this recipe, yes. Regular lasagna noodles need boiling first and will not soften properly in the short bake time. Stick with the oven-ready variety.

Can I freeze the unbaked casserole?

Yes. Assemble the casserole without baking, wrap it tightly, and freeze for up to 2 months. Bake it straight from frozen, adding roughly 20 additional minutes to the covered bake time.

Lazy Lasagna Casserole Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 37 minutes mins

Total Time 52 minutes mins

Servings: 6 servings

Calories: 462

Ingredients Method Notes

Ingredients

  

• 1 tbsp olive oil
• 1 lb ground beef
• 1 medium yellow onion
• 2 cloves garlic
• 1 tsp Italian seasoning
• 24 oz marinara sauce
• 15 oz ricotta cheese
• 1 large egg
• 1/2 cup grated Parmesan
• 2 cups shredded mozzarella
• 6 no-boil lasagna noodles
• Kosher salt and black pepper
• Fresh basil leaves

Method

 

1. Preheat oven to 375°F (190°C). Brown beef and onion in oil for 6-7 minutes. Add garlic and Italian seasoning, cook 30 seconds. Drain fat, stir in marinara, and remove from heat.
2. Mix ricotta, egg, Parmesan, and a pinch of salt and pepper until smooth.
3. Spread a thin layer of meat sauce in a 9×13 dish. Layer 3 noodles, half the ricotta, a third of mozzarella, and half the remaining sauce. Repeat with remaining noodles, ricotta, and sauce, topping with the last of the mozzarella and extra Parmesan if desired.
4. Cover loosely with foil and bake 25 minutes. Uncover and bake 10-12 minutes more, until bubbly and golden. Broil 1-2 minutes for extra color if needed.
5. Let it rest 10 minutes, then slice and serve with fresh basil.

Notes

The casserole really needs that 10-minute rest after baking so the slices hold together. Factor it in when you time dinner. You can also assemble the whole thing the night before and pull it from the fridge while the oven preheats.