Preheat your grill or grill pan over medium-high heat.
Season the chicken breasts with salt and pepper on both sides.
Brush the olive oil onto the grill grates to prevent sticking, then place the chicken breasts on the grill. Grill for about 6-7 minutes on each side, or until the internal temperature reaches 165°F (75°C).
During the last few minutes of grilling, brush the BBQ sauce onto the chicken breasts. Let it caramelize slightly for extra flavor.
Once cooked, remove the chicken from the grill and let it rest for about 5 minutes before slicing it into strips.
In a large bowl, combine the cooked quinoa, chopped romaine lettuce, and cherry tomatoes, mixing well.
Divide this base mixture among bowls, topping each one with sliced grilled chicken, shredded cheddar cheese, and a drizzle of ranch dressing.
Garnish with sliced green onions and avocado, if using.
Notes
Use low-sugar BBQ sauce and light ranch dressing for a healthier option.