Season the chicken breast evenly with chili powder, garlic powder, sea salt, and black pepper.
Heat avocado oil in a large skillet over medium-high heat until shimmering.
Sear the chicken for 5-7 minutes per side until golden brown and cooked through.
Remove chicken to a plate to rest, then slice into thin strips.
In the same skillet, sauté the bell peppers and red onion for 4 minutes until tender and slightly charred.
In a small bowl, toss the cooked brown rice with fresh lime juice and chopped cilantro.
Briefly warm the whole wheat tortilla in a dry pan over medium heat for 20 seconds per side.
Spread the mashed avocado in the center of the tortilla, then layer with the cilantro-lime rice, chicken, and sautéed vegetables.
Fold the bottom of the tortilla up, tuck in the sides, and roll tightly to secure the filling.