Biscuit-Topped Salmon Casserole

1 . Stage

Prepare casserole: Melt butter in a saucepan over medium heat. Add onions and cook until transparent, about 5 minutes. Whisk in flour, salt, and pepper and stir until the mixture becomes paste-like and light golden brown, about 5 minutes. Gradually whisk milk into the flour mixture, and bring to a simmer over medium heat. Cook and stir until the mixture has thickened, 5 to 10 minutes.

2 . Stage

Stir in salmon, tomatoes, Cheddar cheese, and Worcestershire. Pour into a 2-quart casserole dish and set aside.

3 . Stage

Preheat the oven to 450 degrees F (230 degrees C).

4 . Stage

Prepare biscuits: Mix flour, Cheddar cheese, baking powder, and salt together in a bowl. Cut in shortening until mixture resembles fine crumbs. Make a well in the middle and pour in milk; stir quickly until combined. Drop large spoonfuls of biscuit batter around the edge of the casserole dish.

5 . Stage

Bake in the preheated oven until biscuits are golden brown, about 20 minutes.