If using whole, button mushrooms, rinse and slice them. Warm the milk in the microwave for about 1 minute. You want to add it to the pan warm.
Cook:
Heat a medium saucepan or a skillet with sides over medium-high heat. Once hot, melt the butter. Add the sliced mushrooms and salt, and sauté, stirring constantly, until the mushrooms are tender, for about 3 minutes.
Add the warm milk and cream cheese to the mushrooms. Using a spatula or whisk, gently stir until the cream cheese melts and the mixture is cohesive and thick.
Use:
Use this cream of mushroom the same way you'd use 1 can of cream of mushroom soup. If you prefer a smooth cream of mushroom soup texture, pour this in a blender and blend it until smooth.
Notes
This recipe yields the equivalent of 1 can of cream of mushroom soup. It's thick and concentrated and can be diluted with milk or water and turned into soup or used the same way you'd use a can in all recipes.