Cook rice according to package directions.
Cut chicken into bite-sized cubes.
Toss chicken with olive oil, garlic powder, paprika, salt, and pepper.
Heat skillet over medium-high heat. Add chicken.
Cook chicken for 6 to 8 minutes, stirring often, until no pink remains.
Chop vegetables into bite-sized pieces.
Push chicken to one side. Add vegetables to the pan.
Cook vegetables for 4 to 5 minutes until tender-crisp.
Mix sauce ingredients in a small bowl until smooth.
Build bowls: rice on bottom, chicken and vegetables on top, add tomatoes and avocado.
Drizzle with sauce. Add cheese if using.
Serve immediately or store for meal prep.