Prepare the Shrimp: In a medium bowl, combine the shrimp with olive oil, chili powder, cumin, smoked paprika, garlic powder, salt, and pepper. Toss to coat the shrimp evenly in the spices.
Cook the Shrimp: Heat a skillet or grill pan over medium-high heat. Cook the seasoned shrimp for 2-3 minutes per side, or until they turn pink and are fully cooked through. Remove from heat and set aside.
Assemble the Bowl: In a bowl, layer the cooked rice as the base. Add black beans, corn, diced avocado, and cooked shrimp on top.
Garnish: Sprinkle chopped red onion, cilantro, and shredded cheese (if using) over the top. Add a dollop of sour cream or Greek yogurt if desired.
Serve: Serve the Fiesta Shrimp Bowl with lime wedges on the side for a fresh, zesty kick.