Make the Pico de Gallo: Combine all ingredients in a medium bowl; stir. Set aside.
Make the Cilantro Lime Rice: Heat the olive oil in a medium saucepan over medium heat. Add the garlic and rice and toast for 3-4 minutes, stirring constantly. Stir in the water and bring to a simmer. As soon as the pot comes to a simmer, cover with a lid and reduce the heat to low. Cook at a very slow simmer without lifting the lid for 15 minutes. Then remove the pot from the heat and let the rice rest for 10 minutes with the lid on. Fluff the rice; stir in the lime zest, lime juice, cilantro and salt.
Prepare the Chicken: Meanwhile, combine the chili powder, paprika, cumin, garlic powder, salt and pepper in a small bowl. Stir or whisk to mix.
Place the chicken breasts in a zip-top bag or between two sheets of parchment paper and use a meat mallet or rolling pin to pound them to an even ½-inch thickness. Rub the seasoning mixture over all sides of the chicken breasts.
Grill chicken on an outdoor grill or oiled grill pan over medium to medium-high heat for 5-8 minutes per side, or until cooked through. Let the chicken rest for 5 minutes and then chop into bite size pieces.
Assemble the Burrito Bowls: Divide the lettuce evenly between 4 bowls (or meal prep containers). To each bowl, add cilantro lime rice, chicken, pico de gallo, black beans, corn, and avocado or guacamole.