Preheat oven to 400 degrees F. Line a large rimmed baking sheet with foil (optional)
In a large saute pan, heat olive oil over medium heat. Add in chicken, sprinkle with salt and pepper, and cook until no longer pink, about 10-12 minutes. Remove from pan and shred chicken.
Add shredded chicken back into saute pan and stir in buffalo sauce and ranch dressing. Let simmer for 1-2 minutes.
On a baking sheet, add a layer of the corn tortilla chips. Top evenly with the shredded chicken and shredded cheese. Bake for 5-7 minutes, until cheese is melted through.