1. Prepare the Vegetables for Grilling: In a large bowl, combine the sliced bell peppers, zucchini, yellow squash, red onion, and mushrooms. Drizzle with 2 tablespoons of olive oil, then sprinkle with dried oregano, garlic powder, salt, and black pepper. Toss everything gently until the vegetables are evenly coated.

2. Preheat Your Grill: Preheat your outdoor grill to medium-high heat (around 400 F / 200 C). Ensure the grates are clean and lightly oiled to prevent sticking. A well-heated grill is crucial for good grill marks and even cooking.

3. Grill the Vegetables in Batches: Place the seasoned vegetables directly onto the hot grill grates. Grill in batches if necessary to avoid overcrowding, which can steam the vegetables instead of charring them. Cook for 3-5 minutes per side, or until they are tender-crisp and have nice grill marks. The red onion and bell peppers may take slightly longer than the zucchini and squash.

4. Whip the Feta Spread: While the vegetables are grilling, prepare the whipped feta. In a food processor, combine the crumbled feta cheese, Greek yogurt, fresh lemon juice, and 1 tablespoon of olive oil. Process until completely smooth and creamy, scraping down the sides as needed. If it’s too thick, add a tiny splash more olive oil or water until it reaches a spreadable consistency.

5. Assemble the Platter: Once all the vegetables are grilled, arrange them artfully on a large serving platter. You can create sections for each vegetable or mix them for a more rustic look.

6. Serve with Whipped Feta: Spoon the whipped feta generously onto the platter, either in a central dollop or several smaller dollops around the vegetables. Garnish with fresh chopped parsley or mint, if desired, for a pop of color and freshness. Serve immediately and enjoy!