Rinse the rice under cold water until the water runs clear.
Add rice, water, and a pinch of salt to a saucepan. Bring to a boil.
Reduce heat to low, cover, and simmer for 15–18 minutes until the liquid is absorbed.
Remove from heat and let the rice steam for 5 minutes. Fluff with a fork.
In a bowl, combine the diced mango, purple onion, jalapeño, cilantro, and lime juice. Toss gently and set aside.
In a separate small bowl, whisk together the mayonnaise, sriracha, and lime juice until smooth. Set aside.
Pat the shrimp dry with paper towels.
Toss shrimp with olive oil, chili powder, smoked paprika, cumin, and salt until evenly coated.
Heat a cast-iron skillet over medium-high heat.
Sear the shrimp for 2–3 minutes per side until cooked through and nicely charred.
To assemble the Charred Shrimp and Avocado Bowl, divide the rice among serving bowls.
Arrange the charred shrimp, sliced avocado, and mango salsa over the rice.
Drizzle generously with the lime-chili sauce.
Garnish with black sesame seeds and fresh cilantro before serving.