Ingredients
Method
- Brown beef and onion in an oven-proof skillet; drain fat.
- Cook mushrooms until their liquid evaporates; add spinach and cook until wilted.
- Push everything aside; melt butter and whisk in flour to form a roux.
- Slowly whisk in milk and cream over low heat until thickened; season with garlic salt.
- Stir together, top with cheese, and broil until bubbling and golden.
Notes
Squeeze frozen spinach dry to remove excess moisture. The bechamel scorches easily if the heat is too high. You need an oven-proof skillet since it finishes under the broiler - cast iron is ideal. Garlic salt doubles as salt and flavor, so go easy adding salt elsewhere. Mushrooms and spinach both release water and will thin the sauce if not cooked down.
