Heat olive oil in a large skillet or Dutch oven over medium-high heat. Season chicken pieces with salt and pepper, then sear them for 2-3 minutes per side until golden brown. Don't worry if they're not fully cooked through—the chicken will finish cooking in the broth.
Add diced onion to the same skillet and sauté for 2 minutes until fragrant. Stir in minced garlic and ginger powder, cooking for another 30 seconds to bloom the spices. This creates the aromatic base for your entire weeknight rice bowl.
Pour in the chicken broth and bring everything to a boil. Add the uncooked rice, soy sauce, and sesame oil, stirring well to combine all ingredients evenly. Reduce heat to low, cover tightly, and simmer for 15 minutes without lifting the lid.
After 15 minutes, stir in the diced bell peppers and frozen peas and carrots mixture. Cover again and continue simmering for 5 more minutes until the rice is tender and liquid is absorbed. The quick dinner approach means all components finish cooking simultaneously.
Remove from heat and let the chicken rice bowl rest covered for 2 minutes. Fluff with a fork, then garnish generously with chopped green onions and sesame seeds. Serve immediately while the bowl is hot and steaming.