Alfredo With Mushrooms with juice

1 1/2 tablespoons butter 1 1/2 tablespoons flour 1 cup fat-free half-and-half 3 tablespoons parmesan cheese 1/2 teaspoon minced garlic clove 1 dash pepper 6[...]

2 large skinless chicken breasts , cut in 1/2-inch strips 4 tablespoons olive oil , total 1 leek , sliced in 1/2-inch rings, rinsed 1 small onion , diced 1/2[...]