Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the zucchini, red bell pepper, and red onion into uniform bite-sized pieces.
Place the vegetables on the baking sheet, drizzle with olive oil, and sprinkle with half of the sea salt, black pepper, and all of the dried oregano.
Toss the vegetables to coat evenly and roast in the oven for 15-20 minutes until tender and slightly caramelized.
While the vegetables are roasting, heat a large skillet over medium-high heat.
Add the ground beef to the skillet, breaking it up into crumbles with a wooden spoon or spatula.
Season the beef with the garlic powder and the remaining sea salt and black pepper.
Cook the beef for 7-9 minutes until it is completely browned and cooked through, then carefully drain any excess liquid from the pan.
Once the vegetables are finished roasting, transfer them directly into the skillet with the cooked beef.
Toss everything together over low heat for 1 minute to combine the flavors and serve immediately.