Preheat your oven to 425°F and line a large sheet pan with parchment paper or foil for easy cleanup.
Break the ground beef into small crumbles directly on the sheet pan and sprinkle with taco seasoning. Mix well with your hands or a spoon.
Add bell peppers, onion, and cherry tomatoes to the pan. Drizzle everything with olive oil and sprinkle with garlic powder, salt, and pepper. Toss to combine.
Spread everything in an even layer, making sure the beef is broken into bite-sized pieces.
Bake for 18-20 minutes, stirring once halfway through, until the beef is cooked through and vegetables are tender.
Serve over rice, in tortillas, or as a taco salad with your favorite toppings. Enjoy!