Preheat over to 400°.
Add hot sauce, dark brown sugar, salt, garlic, and red pepper flakes to a small saucepan. Bring to a boil.
In a seperate cup, mix 1 teaspoons of corn starch with 1 tablespoon of water. Add the cornstarch slurry to the saucepan and allow the sauce to thicken. Remove from heat.
Reserve half of the firecracker sauce for serving.
Pound chicken breasts to an even thickness, if necessary. Season with salt and pepper.
Heat a skillet with oil over medium/high heat.
Sear chicken for 2 minutes on each side.
Dunk the seared chicken breasts into the saucepan with half of the firecracker sauce to completely cover.
Place chicken on a baking sheet lined with parmchement paper and bake for 20 minutes, basting with additional sauce halfway through.
Chicken is done when its internal temperature is 165°.