1. In a large bowl, combine oil, cilantro, tequila, cumin, garlic, salt, pepper and cayenne.
2. Add chicken and toss to coat.
3. Let marinate for 4-8 hours (let the chicken get drunk!).
4. Heat oven 400°F.
5. Transfer chicken to a baking sheet. Bake 35-40 minutes, or until largest piece is cooked through.
6. Remove from oven and top each breast with a small pat of butter and let melt.
7. Top breasts with shredded Colby jack cheese.