Make the Pico de Gallo: In a medium bowl, combine all ingredients and stir to mix. Set aside while preparing the other components.
Make the Cilantro Lime Rice: Heat olive oil in a medium saucepan over medium heat. Add the garlic and rice, stirring constantly for 3–4 minutes to lightly toast. Pour in the water and bring to a simmer. Once simmering, cover with a lid and reduce heat to low. Cook for 15 minutes without lifting the lid. Remove from heat and let the rice sit, covered, for 10 more minutes. Fluff with a fork and stir in the lime zest, lime juice, cilantro, and salt.
Prepare the Chicken: In a small bowl, mix the chili powder, paprika, cumin, garlic powder, salt, and pepper.
Place the chicken breasts in a zip-top bag or between two sheets of parchment paper and pound to an even ½-inch thickness. Rub the spice mixture over both sides of each piece.
Grill the chicken over medium to medium-high heat on a grill or oiled grill pan for 5–8 minutes per side, until fully cooked. Let the chicken rest for 5 minutes before chopping into bite-sized pieces.
Assemble the Burrito Bowls: Divide lettuce among 4 bowls or meal prep containers. Add portions of cilantro lime rice, grilled chicken, pico de gallo, black beans, corn, and avocado or guacamole to each bowl.