Prepare the Oven: Set your oven temperature to 350°F (175°C) and allow it to heat up, ensuring it's ready for baking. Grease a 9x13-inch baking dish and set aside.

Prepare the Cabbage: In a large pot, bring water to a boil. Introduce the chopped cabbage to the pan and sauté for about 5 to 7 minutes, allowing it to soften slightly while retaining a bit of crunch. Drain the cabbage and set it aside.

Sauté the Onions and Garlic: In a large skillet, heat a bit of oil over medium heat. Incorporate the diced onion into the pan and sauté until it becomes translucent and tender, approximately 5 minutes. Then, add the minced garlic and continue cooking for an additional minute, allowing the flavors to meld.

Make the Cheese Mixture: In a large mixing bowl, combine the shredded cheddar cheese, mozzarella cheese, sour cream, mayonnaise, sautéed onions, garlic, salt, black pepper, and paprika (if using).

Assemble the Casserole: Add the drained cabbage to the cheese mixture and stir until the cabbage is well coated. Transfer the mixture into the prepared baking dish, spreading it out evenly to create a smooth layer.

Add the Topping: In a small bowl, mix the crushed crackers or breadcrumbs with the melted butter. Sprinkle the topping evenly over the cabbage casserole.

Bake: Bake the casserole in the preheated oven for 25-30 minutes, or until the top is golden brown and the cheese is bubbly.

Presentation: Let the casserole rest for a few moments to cool slightly, making it easier to serve. Garnish with fresh herbs if desired and enjoy this comforting, cheesy cabbage bake!