Prepare shrimp and put into a large bowl. Add olive oil, chili powder, minced garlic, oregano and salt & pepper. Stir to combine and put in the refrigerator for 20 minutes to marinate.
While shrimp is marinating, whisk together sauce ingredients, set aside. Then prepare the other ingredients for the tacos. Slice up the cabbage, avocado etc.
Heat a medium-sized skillet over medium high heat and drizzle with olive oil. Sauté shrimp 2 minutes on each side or until cooked through and firm.
Lay down tortillas, add shredded cabbage, avocado slices, pico de gallo, cilantro and shrimp. Finally drizzle with the spicy sauce. Enjoy!