Heat oil in a large skillet over medium-high heat and cook onion with mushrooms until onion is tender, about 6 minutes, stirring occasionally. Stir in remaining ingredients. Reduce heat and simmer covered until heated through, about 10 minutes, stirring occasionally. Serve with tostadas or tortillas.
Fire up the grill for some mouthwatering grilled chicken. Follow these tips to sizzle your way to tender, flavorsome chicken.