Melt 2 Tbsp. Butter in a medium heated pan.
Add 8oz. Diced mushrooms and cook down, about 5 minutes.
Add 1 ½ cups chicken broth and stir.
Add ½ tsp. Onion powder and 1 tsp. Garlic powder.
Mix together in a separate bowl 1 cup milk with ½ cup flour.
Pour into the pan and stir until it thickens.
Salt and pepper to taste, about ½ tsp. pepper and 1 tsp. salt.
