1. Preheat your oven to 400°F (200°C).
2. In a bowl, mix together olive oil, lime juice, chili powder, ground cumin, garlic powder, and salt.
3. Coat the chicken tenderloins with the marinade, ensuring they are evenly covered.
4. Heat butter in an oven-proof skillet over medium heat. Add the chicken tenderloins and cook until golden brown on each side.
5. Transfer the skillet to the oven and bake for 12-15 minutes, or until the chicken is cooked through.
6. Meanwhile, in a separate bowl, combine mayonnaise, sour cream, lime juice, sriracha sauce, garlic powder, smoked paprika, and salt to make the sauce. Mix until smooth.
7. Warm taco shells according to package instructions.
8. Assemble the tacos by filling each shell with the cooked chicken tenderloin, drizzle with sriracha lime sauce, and garnish with your favorite toppings such as diced tomatoes, shredded lettuce, and chopped cilantro.
9. Serve immediately and enjoy the zesty flavors.