Sour Cream Mushroom Dip

1. Preheat an oven to 350 degrees F (175 degrees C).

2. Heat the butter in a skillet over medium heat. Stir in the mushrooms and onion; cook and stir until the mushrooms have softened and the onion is translucent, about 7 minutes. Stir in the spinach, parsley, garlic salt, and pepper. Continue cooking until the spinach has wilted, about 3 minutes. Remove from heat and stir in 1/2 cup of Cheddar cheese. Cool for 5 minutes. Stir in the sour cream, then spread mixture into an 8x8-inch baking dish. Sprinkle 1 cup of Cheddar cheese on top.

3. Bake in the preheated oven until the cheese has melted, about 20 minutes.

Cook's Note

If you want to prepare this ahead of time: after assembling in casserole dish you can place in fridge until half hour before serving time. Put on counter while oven preheats to bring dish to room temperature; bake as per recipe.