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Lightly spray the slow cooker with cooking spray to prevent sticking.
Spread a thin layer of marinara sauce on the bottom of the slow cooker.
Arrange a layer of frozen ravioli over the sauce.
Dollop spoonfuls of ricotta cheese evenly over the ravioli layer.
Sprinkle a layer of mozzarella cheese, followed by a sprinkle of Parmesan cheese.
Add a little Italian seasoning and garlic powder over the cheese.
Repeat layers (sauce, ravioli, ricotta, mozzarella, Parmesan, seasonings) until all ingredients are used, ending with a layer of cheese on top.
Cover and cook on low for 3-4 hours or on high for 1.5-2 hours, until the ravioli are tender and the cheese is bubbly.
Let the lasagna rest for 10 minutes before serving. Garnish with fresh basil or parsley if desired.
Serving and Storage Tips
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