In a medium bowl, combine the garlic powder, paprika, chili powder, and black pepper.
Toss the chicken tenderloins with the spice mixture until they are evenly coated.
Heat half of the oil in a large non-stick sauté pan over medium-high heat until hot.
Add half of the chicken to the pan and cook until golden, about 3–4 minutes; flip and cook until the center is no longer pink and the internal temperature reaches 165°F (74°C).
Remove the cooked chicken and set aside, then add the remaining oil and cook the remaining chicken the same way.
Pour the hot sauce over all the cooked chicken and toss well to coat each strip.
Serve the buffalo chicken strips with celery sticks and skinny blue cheese dressing, if desired.