Follow these simple steps to create a delicious and crowd-pleasing Cheesy Asparagus Casserole:

1. Prepare the Asparagus: Preheat your oven to 375°F (190°C). Wash the asparagus thoroughly under cold water. Snap off the tough, woody ends of the asparagus stalks. You can either snap them with your hands or trim them with a knife, about 1-2 inches from the bottom. Cut the asparagus spears into 1-2 inch pieces. This makes them easier to eat and ensures even cooking.
2. Sauté the Asparagus (Optional but Recommended): While optional, briefly sautéing the asparagus enhances its flavor and ensures it’s tender-crisp in the final casserole. Melt 2 tablespoons of butter in a large skillet over medium heat. Add the asparagus pieces and sauté for 3-5 minutes, stirring occasionally, until they turn bright green and are slightly tender-crisp. Don’t overcook them at this stage as they will cook further in the oven. Remove from the skillet and set aside. If you prefer to skip this step, you can use raw asparagus, but the final texture may be slightly less tender.
3. Make the Cream Sauce: In the same skillet (no need to wash it), melt the remaining 1/4 cup of butter over medium heat. Once melted, whisk in the flour and cook for 1-2 minutes, stirring constantly, to create a roux. This step is crucial for a smooth, lump-free sauce. Cook until the roux is lightly golden and fragrant.
4. Incorporate the Milk and Cream Cheese: Slowly whisk in the milk, a little at a time, ensuring each addition is fully incorporated before adding more. Continue whisking until the sauce is smooth and begins to thicken slightly. Reduce the heat to low. Add the softened cream cheese to the sauce and whisk until it is completely melted and the sauce is creamy and smooth.
5. Add Cheese and Seasoning: Remove the skillet from the heat. Stir in the shredded cheddar cheese and parmesan cheese until they are melted and the sauce is cheesy and well combined. Season the sauce with onion powder, garlic powder, salt, and black pepper to taste. Start with the recommended amounts and adjust according to your preference. Taste and adjust seasonings as needed.
6. Assemble the Casserole: Grease a 9×13 inch baking dish. Spread the sautéed (or raw) asparagus pieces evenly in the bottom of the prepared baking dish. Pour the creamy cheese sauce evenly over the asparagus, ensuring all the asparagus is coated.
7. Prepare the Breadcrumb Topping: In a small bowl, combine the breadcrumbs and melted butter. Toss to coat the breadcrumbs evenly with the melted butter.
8. Add the Topping and Bake: Sprinkle the buttered breadcrumbs evenly over the cheese sauce in the casserole dish. Bake in the preheated oven for 20-25 minutes, or until the casserole is bubbly around the edges, the cheese sauce is heated through, and the breadcrumb topping is golden brown and crispy.
9. Let it Rest and Serve: Remove the casserole from the oven and let it stand for 5-10 minutes before serving. This allows the casserole to set slightly and makes it easier to serve. Serve hot and enjoy!