In a large bowl, combine the Greek yogurt, olive oil, lemon juice, minced garlic, oregano, thyme, salt, black pepper, paprika, and red pepper flakes. Mix well to create a marinade.
Add the chicken tenders to the marinade, ensuring they are well-coated. Cover the bowl with plastic wrap and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.
Preheat your grill or a skillet over medium-high heat. If using a skillet, add a little olive oil to prevent sticking.
Remove the chicken tenders from the marinade, allowing any excess to drip off.
Grill or cook the chicken tenders for about 4-5 minutes on each side, or until they are cooked through and have nice grill marks. The internal temperature should reach 165°F.
Once cooked, remove the chicken from the heat and let it rest for a few minutes. Garnish with fresh chopped parsley before serving.