½ teaspoon onion powder
¼ teaspoon nutmeg (freshly grated is magical)
1½ cups shredded sharp cheddar cheese
½ cup grated Parmesan cheese
Salt and pepper to taste
For the Topping:
1 cup panko breadcrumbs
¼ cup grated Parmesan cheese
2 tablespoons unsalted butter, melted
2 tablespoons fresh parsley, chopped (optional)
Zest of ½ lemon (optional, but brightens everything)
The Method: Roast, Sauce, Top, Bake
Step 1: Preheat and Prep
Preheat your oven to 400°F (200°C). Lightly grease a 9×13-inch baking dish or similar-sized casserole dish.
Step 2: Roast the Asparagus
Trim the woody ends from the asparagus (bend a spear—it will snap naturally where the tender part begins).
Spread asparagus on a baking sheet. Drizzle with olive oil and sprinkle with salt and pepper. Toss to coat.
Roast for 8-10 minutes, until bright green and just tender but still with some bite. They’ll cook further in the casserole, so don’t overdo it.
Remove from oven and set aside. Reduce oven temperature to 375°F (190°C).
Step 3: Make the Cheese Sauce
In a medium saucepan, melt butter over medium heat.
Whisk in flour and cook for 1-2 minutes, stirring constantly, until golden and bubbly. This cooks out the raw flour taste.
Slowly whisk in warm milk (and cream, if using) until smooth. Continue whisking until the sauce thickens, 3-5 minutes.
Remove from heat. Stir in Dijon mustard, garlic powder, onion powder, nutmeg, salt, and pepper.
Gradually add cheddar and Parmesan, stirring until completely melted and smooth.
Taste and adjust seasoning. The sauce should be rich, savory, and just slightly sharp.
Step 4: Assemble the Casserole
Arrange the roasted asparagus in the prepared baking dish in a single layer (or slightly overlapping if needed).
Pour the cheese sauce evenly over the asparagus, ensuring all spears are coated.
If you want extra cheesiness (and why wouldn’t you?), sprinkle an additional ½ cup cheddar over the top.
Step 5: Make the Topping
In a small bowl, combine panko, Parmesan, melted butter, parsley, and lemon zest (if using). Mix until the crumbs are evenly moistened.
Sprinkle the topping evenly over the casserole.
Step 6: Bake
Bake at 375°F (190°C) for 20-25 minutes, until bubbly, golden, and the topping is crisp.
For extra browning, broil for 1-2 minutes at the end—watch carefully to prevent burning.
Step 7: Rest and Serve
Let the casserole rest for 5-10 minutes before serving. This allows the sauce to settle and makes serving easier.
Garnish with additional fresh parsley if desired.
Pro-Tips for Asparagus Casserole Perfection
1. Don’t Overcook the Asparagus Initially
The 8-10 minute roast should leave the asparagus with a slight bite. It will continue cooking in the sauce and emerge perfectly tender, not mushy.
2. Warm Milk Prevents Lumps
Cold milk added to a hot roux can create lumps. Warm the milk briefly in the microwave or a small saucepan before adding.
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