Combine oil, garlic, thyme, lemon zest, and lemon juice in a large bowl. Season chicken with salt and pepper. Toss chicken in oil mixture. Set aside to marinate, about 5 minutes.
Spray a non-stick skillet with cooking spray and place over medium-high heat. Cook chicken tenders until lightly brown and cooked through, about 4 minutes per side. An instant-read thermometer inserted into the center should read at least 165 degrees F (74 degrees C).
