Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the zucchini, red bell pepper, and red onion into uniform half-inch pieces to ensure even roasting.
Place the vegetables on the baking sheet and toss with 0.5 tbsp of olive oil, balsamic vinegar, half of the salt, and half of the pepper.
Spread the vegetables in a single layer and roast for 20-25 minutes, tossing halfway through, until they are tender and show golden caramelized edges.
While the vegetables roast, heat the remaining 0.5 tbsp of olive oil in a large skillet over medium-high heat.
Add the ground turkey to the skillet, using a spatula to break it into small crumbles as it browns for about 7-9 minutes.
Stir in the minced garlic, dried oregano, and the remaining salt and pepper, cooking for another 2 minutes until the turkey is fragrant and fully cooked.
Remove the roasted vegetables from the oven and fold them into the skillet with the turkey, stirring gently to combine all the savory juices before serving.