Ingredients
Equipment
Method
Step-by-Step Instructions
- Preheat your oven to 375°F (190°C) and grease a 9x13 inch baking dish with butter or cooking spray.
- Peel and slice russet potatoes into ¼-inch rounds. Layer half in the baking dish, seasoning with salt and pepper.
- In a skillet, melt 2 tablespoons of butter over medium heat and sauté diced onions until translucent, about 4-5 minutes.
- Sprinkle 2 tablespoons of all-purpose flour over sautéed onions, stirring for about a minute. Gradually whisk in 1 cup of whole milk until thickened, about 3-5 minutes.
- Stir in the drained tuna, ½ teaspoon of garlic powder, and 2 cups of shredded cheddar cheese until combined.
- Spread the creamy tuna mixture over the first layer of potatoes and top with remaining potato slices.
- Sprinkle remaining cheddar cheese and a layer of breadcrumbs, adding melted butter for extra crispness if desired.
- Cover with aluminum foil and bake for 45 minutes, then uncover and bake for an additional 15 minutes until golden brown.
- Let the casserole rest for 10-15 minutes before serving, garnished with fresh parsley.
Nutrition
Notes
Allow assembled casserole to rest for 15 minutes before baking for better flavor blending. Use a sharp knife or mandoline for even potato slices.
