Slow Cooker Beef and Cheese Ravioli Lasagna

Slow Cooker Beef and Cheese Ravioli Lasagna

Ingredients
– 1 tablespoon olive oil
– 1 medium onion, finely chopped
– 2 garlic cloves, minced
– 1 pound ground beef
– Salt and pepper, to taste
– 1 teaspoon Italian seasoning
– 1 (24-ounce) jar marinara sauce
– 1 (25-ounce) bag frozen cheese ravioli
– 1 (15-ounce) container of whole milk ricotta cheese
– 1 large egg
– 2 tablespoons freshly chopped parsley, plus more for garnish
– 3 cups shredded mozzarella cheese
– 1 cup grated Parmesan cheese
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