Heat 1/2 tbsp butter in a large sauté pan over medium heat until melted
Add egg, cook until scrambled. Remove to a separate plate.
Melt 1 tbsp butter in pan. Add onion to pan and cook 2-3 minutes. Add garlic, peas and carrots along with salt and pepper. Sauté until all ingredients are tender and warmed through, about 4-5 minutes.
Increase heat to high, add in remaining butter, and stir until melted. Add rice, green onion, and soy sauce. Stir until combined. Continue sautéing until all ingredients are heated through, stirring occasionally.
Add eggs, stir, and cook until heated.
Remove from heat, add sesame oil, and stir well.
Taste and season with additional soy sauce if needed.