Mix together flour, salt, pepper chili powder, and garlic powder in medium bowl.
Cut chicken into 1 inch pieces and place in flour mixture. Toss to coat chicken in flour mixture.
Heat olive oil in a skillet over mid-high heat and cook chicken 5-10. mins or until cooked.
Warm flour tortillas on low heat in oven while cooking chicken.
Serve tortillas layered with chicken, lettuce, black beans, shredded cheese.
Add white sauce (optional) and serve with guacamole and chips.