Mustard and Honey Chicken Tacos

1. Dice the chicken breast and season with salt and black pepper.

2. In a bowl, mix mustard and honey to create the marinade. Add the chicken and coat evenly. Marinate for at least 15 minutes.

3. In a skillet, cook marinated chicken over medium-high heat until golden brown.

4. Add diced onion and bell pepper, and cook until softened.

5. Serve the chicken mixture in taco shells or lettuce cups, drizzled with ketchup and topped with fresh lettuce.