Crockpot Ravioli Lasagna

Ingredients:

1 pound ground beef

1 can (24 ounce) pasta sauce

1 package (25 ounce) frozen cheese ravioli

1 cup shredded mozzarella cheese

1 cup shredded cheddar cheese

1/4 cup grated Parmesan cheese

1/2 teaspoon garlic powder

1/2 teaspoon dried oregano

1/4 teaspoon black pepper