In a mixing bowl, combine the large shrimp with olive oil, garlic powder, onion powder, salt, and black pepper. Toss until the shrimp are evenly coated with the spices. Let them marinate for about 10 minutes.

Preheat your grill or grill pan over medium-high heat for 5 minutes. Once hot, place the marinated shrimp on the grill and cook for 2–3 minutes per side until they turn pink and develop nice char marks.

In a separate bowl, mix together the diced mango, chopped red onion, finely chopped jalapeño, cilantro, and lime juice. Season with salt and pepper.

In a medium bowl, whisk together mayonnaise, Sriracha, a splash of lime juice, garlic powder, onion powder, salt, and pepper. Continue whisking until the mixture is smooth and creamy.

Divide the warm cooked rice among your serving bowls. Top each portion with grilled shrimp, fresh avocado slices, and a scoop of mango salsa. Drizzle the sauce over the top.