In a large saucepan, melt ½ cup butter over medium-low heat.
Add ½ cup sliced mushrooms and cook over medium-high heat for 5-7 minutes until the mushrooms are tender and have released most of their liquid.
Stir in 1 cup chicken broth, 1 teaspoon salt, ½ teaspoon pepper, and ½ teaspoon garlic powder. Bring the mixture to a low simmer.
In a small bowl, whisk together 6 tablespoons all-purpose flour and 1 cup milk until smooth.
Stir this mixture into the sauce pan.
Bring to a simmer and cook until it begins to the soup begins to thicken (3-5 minutes).
Remove from heat and allow to cool completely.
Store in airtight container in refrigerator until ready to use. Enjoy!
Notes
You can use any type of mushrooms for this recipe. I use button mushrooms but any will work in this recipe. This recipe makes approximately 2 cups which is approximately the size of a regular can of cream of mushroom soup (10.5 ounces). Refrigerate until ready to use in an airtight container for up to 5 days.