Grilled Chicken Sandwich

Pound chicken breasts to even 3/4-inch thickness for uniform cooking. In a small bowl, whisk together olive oil, lemon juice, minced garlic, oregano, paprika, salt, and pepper to create a marinade. Place chicken in the marinade and let sit for 5-10 minutes while preheating your grill or grill pan to medium-high heat. This quick marinade will infuse the chicken with flavor and help keep it moist during grilling.

Remove chicken from marinade and place on the preheated grill. Cook for 6-7 minutes per side without moving, until internal temperature reaches 165°F and chicken has beautiful grill marks. In the last minute of cooking, place cheese slices on top of each chicken breast to melt. Remove from grill and let rest for 2-3 minutes before slicing or serving whole.

Cut burger buns in half and toast them cut-side down on the grill or in a toaster until golden brown and crispy. Mix mayonnaise and Dijon mustard in a small bowl for the sandwich spread. To assemble: spread the mayo-mustard mixture on both bun halves, place lettuce on the bottom bun, add the grilled chicken with melted cheese, then layer with tomato slices, red onion, avocado, and bacon if using. Top with the other bun half and serve immediately.