Prep all ingredients per the instructions above.
Rinse the brown rice under cold water. Cook according to package directions using water. Once tender, season with salt and black pepper and set aside.
In a small bowl, mix the tomato, red onion, cilantro, lime juice, and salt to prepare the pico de gallo. Set aside to allow the flavors to meld.
In another bowl, mash the avocado until smooth. Stir in the lime juice, red onion, cilantro, and salt. Cover and refrigerate until ready to use.
Pat the chicken dry and season evenly with chili powder, cumin, garlic powder, salt, and black pepper.
Heat the olive oil in a skillet over medium heat. Add the chicken and sauté, stirring occasionally, until fully cooked and the internal temperature reaches 165°F (74°C). Remove from the skillet and set aside.
In the same skillet, heat the remaining olive oil over medium heat. Add the bell pepper and yellow onion and sauté until softened and lightly caramelized.
Warm the flour tortillas in a dry skillet or microwave until soft and pliable.
Assemble the burritos by layering brown rice, chicken, peppers, onions, pico de gallo, and shredded lettuce onto the tortillas. Fold in the sides and roll tightly.
In a large glass or pitcher, combine the sparkling water, lemon slices, and chia seeds. Stir well and let sit for 2–3 minutes to allow the chia seeds to hydrate.
Serve the burritos with tortilla chips, guacamole, and lemon chia sparkling water.