Preheat Fan oven to 180 degrees C or 350 degrees F.
Chicken: Chop your chicken breasts into 3 large chunks each.
In a large bowl, place the chicken, olive oil, and burrito seasoning. Use our hands to mix the seasoning and oil into the chicken so its thoroughly coated.
Transfer the chicken to a baking tray (if using a non stick tray, use a little more oil before placing chicken in)
Bake for 30 minutes – 180 degrees C/320 degrees F
Remove chicken and use 2 forks to shred the meat in the baking tray.
Make guacamole: mash up the avocado and add in the diced onion. Stir through, add a squeeze of lime juice and salt to taste.
Assemble the Bowls: Place the brown rice on the bottom, and arrange on top in sections, the black beans, corn, chopped tomatoes, cucumber, and shredded chicken.
Add a little salsa to the side of the chicken, along with guacamole and sour cream. Serve immediately.