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Costco Lasagna from Scratch

A full-tray lasagna made with Costco Italian sausage, Rao's marinara, and Kirkland ricotta — layered, baked, and fed to 12 people for less than $30.

Prep Time
30 min
Cook Time
1 hr
Servings
12
Cost / Serving
$3.25

Quick Answer

Layer browned Kirkland Italian sausage in Rao's marinara, ricotta-egg mixture, and mozzarella between no-boil pasta sheets. Bake covered at 375°F for 45 minutes, then uncovered for 15 to brown the top. Total 90 minutes; feeds 12 for under $30.

Homemade lasagna from Costco ingredients is the ultimate value meal: Kirkland Italian sausage, Rao's marinara, a large tub of Costco ricotta, and shredded mozzarella. This recipe fills a full 9x13 pan and feeds 12 people generously — at a cost that's hard to beat. It takes about 90 minutes total but most of that is hands-off oven time.

Instructions

  1. 1

    Preheat oven to 375°F. Cook sausage in a skillet over medium-high heat, breaking it up, until fully browned. Drain fat. Stir in one jar of marinara and simmer 5 minutes.

  2. 2

    Mix ricotta, 1 cup mozzarella, ½ cup Parmesan, eggs, Italian seasoning, garlic powder, salt, and pepper in a bowl until combined.

  3. 3

    Spread ½ cup of plain marinara (from the second jar) across the bottom of a 9x13 baking dish.

  4. 4

    Layer: 3 lasagna noodles, half the meat sauce, half the ricotta mixture, ½ cup mozzarella. Repeat: 3 noodles, remaining meat sauce, remaining ricotta, ½ cup mozzarella.

  5. 5

    Top with remaining 3 noodles. Pour remaining plain marinara over the top. Spread to cover all noodles completely.

  6. 6

    Top with remaining 1 cup mozzarella and ½ cup Parmesan. Cover tightly with foil.

  7. 7

    Bake covered 45 minutes. Remove foil and bake 15 minutes more until cheese is golden and bubbling. Rest 15 minutes before cutting — this is essential for clean slices.

Frequently Asked Questions

Should I use oven-ready or regular lasagna noodles?+
Oven-ready (no-boil) lasagna noodles are simpler and work well when your sauce has enough moisture to hydrate them during baking. Regular noodles give a slightly more delicate texture but require pre-boiling. Both work — oven-ready saves 20 minutes. If using oven-ready, make sure the sauce completely covers the noodles.
Can I make Costco lasagna ahead of time?+
Yes — assemble the lasagna up to 24 hours ahead, cover tightly, and refrigerate unbaked. Add 15–20 minutes to the covered bake time since it starts cold. Alternatively, bake it fully, cool, and refrigerate for up to 4 days. Reheat slices in the microwave or the full pan in a 325°F oven.
Why should I let lasagna rest before cutting?+
Lasagna needs to rest 10–15 minutes after baking so the layers firm up. Cutting immediately results in a sloppy, sliding mess. The resting time lets the ricotta and sauce set enough to hold clean slices. For the cleanest cuts, use a sharp knife and wipe the blade between slices.
Can I freeze homemade lasagna?+
Yes — lasagna is one of the best foods to freeze. Freeze baked or unbaked, tightly wrapped in foil and then in a freezer bag, for up to 3 months. Bake from frozen at 350°F covered for 60 minutes, then uncovered for 20 minutes. Or thaw overnight and bake normally.
Can I use beef instead of Italian sausage in lasagna?+
Yes — 1.5 lbs of ground beef is a direct substitute. Add 1 teaspoon Italian seasoning, ½ teaspoon fennel seeds, and extra garlic to replicate the flavor depth that sausage provides naturally. A 50/50 blend of sausage and ground beef is also excellent.

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