Place tofu on several layers of paper towels; let stand 10 minutes. Cut tofu into 1-inch cubes.
Prepare rice according to package directions, omitting salt and fat. Add 1/4 teaspoon salt to rice; fluff with a fork.
Heat 2 teaspoons oil in a large nonstick skillet over medium-high heat. Add garlic, ginger, and bell pepper to pan; sauté for 3 minutes. Stir in 3/4 cup onions, vinegar, and soy sauce; cook for 30 seconds. Remove from pan. Wipe skillet with paper towels; recoat pan with cooking spray.
Place pan over medium-high heat. Sprinkle tofu with remaining 1/2 teaspoon salt and black pepper. Add tofu to pan; cook 8 minutes or until golden, turning to brown on all sides. Return bell pepper mixture to pan, and cook 1 minute or until thoroughly heated. Drizzle tofu mixture with remaining 1 teaspoon oil; top with sesame seeds. Serve tofu mixture with rice; top with sprouts and remaining 1/4 cup onions.