Cook chicken breast fully. Chop chicken in fine bites. Add onion and rotel tomatoes (drained) and simmer for 15 minutes.
While chicken is simmering, heat vegitable oil in seperate pan at very high temperature. Place flour tortilla in pan and cook one at a time. Brown both sides and remove to a side plate. I always place a paper towel on the plate to absorb excess oil and seperate each flour tortilla the same thereafter.
After all is cooked, place tortillas on separate plates and top with queso chicken. They eat it like a pizza. My toddler likes her tortillas shredded and queso chicken applied all over in a bowl. Easier to eat for the little ones.