Slice the chicken breast into thin strips and season evenly with the ground cumin, smoked paprika, sea salt, and black pepper.
Heat half of the avocado oil in a large non-stick skillet over medium-high heat.
Add the sliced bell peppers and red onions to the skillet, sautéing for 3-4 minutes until they are tender and slightly charred.
Push the vegetables to the side of the pan and add the seasoned chicken strips, cooking for 5-6 minutes until golden brown and cooked through.
Remove the chicken and vegetable mixture from the skillet and set aside.
Wipe the skillet clean, add the remaining oil, and place the whole wheat tortilla in the pan.
Sprinkle half of the shredded cheddar cheese over one half of the tortilla, then layer the chicken and pepper mixture on top.
Top the filling with the remaining cheese and fold the tortilla in half.
Cook for 2 minutes per side until the tortilla is golden-brown and the cheese is completely melted.
Slice into wedges and serve immediately while hot.