CHI-CHI'S CHICKEN FAJITAS Categories: Mexico, Restaurants, Poultry Yield: 1 Servings From: Brett Jones In the last 17 years, I've worked for a LOT of restaurants :) My favorite trick was from Chi-Chi's [ha! I NEVER signed that non-disclosure agreement] .... the absolute best marinade for chicken (we used it for our fajitas) is margarita mix. Yes, just go out and find your favorite margarita mix (Mr & Mrs T's is good) or a little sweet & sour, put the chicken breasts in a shallow pan and cover with the mix. Marinate at least overnight, preferably for 24 hours.