Cut chicken breast into cubes.
Slice onion and bell pepper thinly.
Season chicken breast with salt, pepper, and garlic powder.
Heat oil in a pan and cook chicken breast until golden on both sides.
Push the chicken breast to one side of the pan and stir-fry the vegetables.
Mix the seared chicken and vegetables together like a steak.
Put the chicken and vegetables in low-sugar whole wheat bread.
Top with diced vegetables and low-fat yogurt sauce.