Easy Chicken with butter

1 tablespoon olive oil 1/2 red onion , Thinly Sliced (About 1 Cup) 10 ounces white mushrooms , Sliced (About 3 Cups) 2 medium garlic cloves , Minced (about 1[...]

4 tablespoons butter 2 -4 tablespoons flour 2 -3 cloves fresh minced garlic (optional) 1 3/4 cups half-and-half cream (OR 3/4 cup milk with 1 cup half and[...]