In a 12" cast-iron skillet over medium high heat, add 2 Tbsp. of olive oil. Season both sides of chicken breasts evenly with ¼ tsp. pepper. Add chicken to skillet and sear until golden on both sides, about 5 min. per side. Transfer to a plate to let rest.
2
Add remaining olive oil to skillet. Add chopped onion and garlic, season with remaining pepper and cook until onion starts to become translucent and garlic is fragrant, about 2 min. Add cherry tomatoes and corn, stir to coat in onion-garlic mixture. Lower heat to medium; cover and let cook for about 15 min. until tomatoes burst open.
3
Meanwhile, slice chicken breasts on a diagonal.
4
Remove lid from skillet; top tomato and corn mixture with sliced chicken and cubed VELVEETA. Cover to let VELVEETA melt and chicken warm, about 10 min. Remove lid. Garnish with fresh basil and serve.