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.
3. Grate Your Own Cheese
Pre-shredded cheese contains anti-caking agents that prevent smooth melting. Grating your own takes 2 minutes and transforms the sauce.
4. Fresh Nutmeg Makes a Difference
A pinch of freshly grated nutmeg is subtle but irreplaceable. It doesn’t taste like nutmeg—it just makes everything taste more like itself.
5. Don’t Skip the Rest
That 5-10 minute rest isn’t optional. It lets the casserole set up so you get clean servings, not a soupy mess.
6. Asparagus Thickness Matters
Thicker spears hold up better in a casserole. If yours are pencil-thin, reduce initial roasting time to 5-6 minutes.
