Craving lasagna but short on time? Make the Easiest Ever Crockpot Lasagna with this hands-off recipe! Simple to assemble, cooks all day, & freezes great. Get the recipe now!
Heat olive oil in a large skillet over medium-high heat. Add ground beef (or Italian sausage) and chopped onion, breaking up the meat with a spoon. Cook until meat is browned and onion is softened, about 6-8 minutes. Drain any excess fat. Stir in minced garlic and cook for 1 minute more until fragrant. Set aside.
In a large bowl, combine ricotta cheese, egg, 1/2 cup Parmesan cheese, Italian seasoning, salt, and black pepper. Mix well until everything is thoroughly combined.
Pour about 1 cup of marinara sauce into the bottom of a 6-quart oval slow cooker, spreading it evenly. Add 1/2 cup water to the remaining marinara sauce in the jar and stir to combine. This thinned sauce helps prevent sticking and ensures moisture for the noodles.
Place 3-4 no-boil lasagna noodles over the sauce, breaking them as needed to fit the shape of the slow cooker. Try not to overlap them too much.
Spread half of the ricotta cheese mixture evenly over the noodles. Top with half of the cooked meat mixture and then sprinkle with 1 cup of shredded mozzarella cheese.
Pour about 1 cup of the thinned marinara sauce over the mozzarella layer.
Repeat layers: noodles, remaining ricotta mixture, remaining meat mixture, and then sprinkle with the remaining 1 cup mozzarella cheese. Finally, cover with the remaining thinned marinara sauce.
Cover the slow cooker and cook on LOW for 6-8 hours or on HIGH for 3-4 hours, until noodles are tender and cheese is bubbly. Cooking times may vary slightly by slow cooker.
Once cooked, turn off the slow cooker and let the lasagna rest for 15-20 minutes with the lid slightly ajar. This allows it to set up and makes for easier serving.
Garnish with additional grated Parmesan cheese and fresh parsley (if desired) before serving. Enjoy!
Notes
Freezing: Leftover lasagna freezes beautifully! Allow to cool completely, then portion into individual servings or a whole pan. Wrap tightly in plastic wrap and then foil. Freeze for up to 3 months. Thaw overnight in the refrigerator and reheat in the oven or microwave.Vegetarian Option: Omit the ground meat and add sautéed mushrooms, spinach (squeezed dry), or zucchini for a delicious vegetarian version. You can also layer with roasted vegetables.Sauce: For extra flavor, you can use homemade marinara sauce or add a splash of red wine or a pinch of red pepper flakes to your jarred sauce.Noodles: Ensure you use no-boil lasagna noodles. Regular lasagna noodles will not cook properly in the slow cooker.