Pat the shrimp dry, then season them with salt, pepper, and garlic powder. Lightly coat the shrimp in cornstarch, dip them in beaten egg, and press them into panko breadcrumbs.
Arrange the shrimp on a baking sheet or cook them in a lightly oiled skillet until golden and crisp. If baking, flip halfway through so both sides get nicely browned.
In a small bowl, stir together mayonnaise, sweet chili sauce, hot sauce, and lime juice. Taste and adjust the heat or tang to your liking.
Add rice to each bowl, then top with cabbage, carrots, cucumber, and crispy shrimp. Drizzle generously with the sauce and finish with green onions and sesame seeds.
If you are making these ahead, store the rice, vegetables, shrimp, and sauce in separate containers. Assemble right before eating for the best texture.