Season Chicken: Season the chicken breasts with salt, pepper, and taco seasoning.
Cook Chicken: Heat a large skillet over medium-high heat and add a bit of olive oil. Cook the chicken breasts for about 6-8 minutes on each side, or until fully cooked. Remove from skillet and let rest, then slice into strips.
Prepare Crema: In a small bowl, mix the sour cream, minced garlic, olive oil, salt, and pepper until smooth.
Assemble Bowls: Divide the pre-cooked brown rice into bowls. Top with sweet corn, black beans, tomato salsa, sliced avocado (if using), jalapenos, romaine lettuce, and sliced chicken breasts.
Add Crema: Drizzle the garlic crema over the assembled bowls.