Cut the salmon into bite-size cubes and place in a medium bowl. Add the soy sauce, sweet chili sauce, mayonnaise, sesame oil, garlic powder, and chili flakes. Gently stir to coat the salmon evenly. Let sit for 10 minutes to marinate.
Heat a nonstick skillet over medium-high heat. Add the marinated salmon and cook without additional oil, stirring occasionally, until lightly seared on all sides and the sauce has reduced, about 4 to 6 minutes. Do not overcook—the salmon should remain tender inside.
To serve, divide the warm rice between two bowls. Top with the seared salmon, edamame, avocado, cucumber, and cilantro. Sprinkle with sesame seeds. Serve immediately.