Steps
1. In a bowl, marinate the sliced chicken breast with coffee grounds, soy sauce, salt, and pepper for 15 minutes.
2. Heat olive oil in a skillet over medium-high heat.
3. Add the marinated chicken to the skillet and cook for about 5-7 minutes until browned and cooked through.
4. Add the sliced bell pepper and onion, stirring frequently, and cook for an additional 3-4 minutes until vegetables are tender.
5. Garnish with fresh cilantro before serving.