In a large skillet or wok, heat the olive oil over medium-high heat. Add the minced garlic and sauté for about 30 seconds until fragrant, being careful not to burn it.
Add the ground beef to the skillet. Use a wooden spoon to break it up and cook until browned, about 5-7 minutes. Drain any excess fat if necessary.
Add the diced red bell pepper, sliced zucchini, sugar snap peas, shredded carrots, and sliced mushrooms to the skillet. Stir well and cook for 4-5 minutes until vegetables are tender but still crisp.
In a small bowl, whisk together the light brown sugar, reduced-sodium soy sauce, sesame oil, ground ginger, crushed red pepper flakes, and pepper. Pour the sauce over the beef and vegetables, stirring to coat evenly. Let simmer for 2-3 minutes.
Serve the stir fry over cooked white rice. Garnish with sliced green onions and sesame seeds. Enjoy your homemade Korean Ground Beef Stir Fry!