Slow Cooker Cheesy Tortellini

Ingredients

• tablespoon olive oil
• pound ground beef
• onion
• garlic
• ounce can crushed tomatoes
• ounce can diced tomatoes and green chiles, undrained
• teaspoon dried oregano
• teaspoon dried basil
• teaspoon crushed red pepper flakes
• Kosher salt and freshly ground black pepper
• ounce package refrigerated three cheese tortellini
• shredded mozzarella cheese
• shredded cheddar cheese
• tablespoons chopped fresh parsley leaves