In a bowl, toss shrimp with chili powder, salt, and pepper.
Heat a skillet over medium-high heat.
Add shrimp to the skillet and cook for 2-3 minutes on each side until pink.
Warm the corn tortillas in another skillet or microwave.
Assemble the tacos by placing shrimp on each tortilla.
Top with diced avocado and tomatoes.
Sprinkle with chopped cilantro.
Drizzle with lime juice for added flavor.
Add sour cream or salsa if desired.
Serve immediately and enjoy!