Prep all ingredients per instructions above.
Cook the rice according to package instructions. Season with salt and pepper to taste.
Cook the chicken: In a skillet, heat the olive oil over medium heat. Season the chicken with chili powder, cumin, garlic powder, salt, and pepper. Cook the chicken, browning well, to an internal temperature of 160°F (71°C). Set aside.
Make the guacamole: Slice the avocados in half, remove the pits, and scoop the flesh into a mixing bowl. Mash the avocado with a fork and make it as chunky or smooth as you'd like. Add the remaining ingredients and stir together. Give it a taste test and add more salt or lime juice if needed.
Assemble burritos: Lay out the flour tortillas. In the center of each tortilla, add cooked rice, chicken, diced tomatoes, shredded cheddar cheese. Add some of the guacamole on top.
Fold the sides of the tortilla over the filling, then roll it up tightly to form a burrito.
Combine sparkling water and lemon slices. Serve over ice if desired.
Enjoy chicken and rice burrito with chips and guac and lemon sparkling water.