Prep Your Oven and Pan: Preheat your oven to a hot 400°F (200°C). This higher heat is key to getting those crispy edges. While it heats, grab a large baking sheet. For easier cleanup, you can line it with parchment paper, but sometimes roasting directly on the metal helps with crisping.
Chop the Veggies: Wash your squash and zucchini really well. Trim off the ends. Now, slice them into pieces that are roughly the same size – about 1/2 inch thick circles or half-moons. Uniform size means they'll all cook at the same rate!
Season Generously: Put the sliced squash and zucchini into a large bowl. Drizzle the extra virgin olive oil over them. Sprinkle the garlic powder, Italian seasoning, sea salt, and black pepper over the top. Now, toss everything gently with your hands or a spatula until all the pieces are nicely coated in the oil and seasonings.
Roast 'Em Up: Spread the seasoned veggies out on your prepared baking sheet in a single layer. This is CRUCIAL for crispiness! If they're crowded, they'll steam instead of roast. If you have too many for one sheet, use two. Pop the sheet into your preheated oven.
Roast Until Tender and Golden: Roast for about 20-25 minutes. Around the 15-minute mark, you can give them a little stir or flip some pieces to ensure even browning. You're looking for the squash to be tender when pierced with a fork and to have some lovely golden-brown, slightly caramelized spots.
Serve Hot: Carefully remove the baking sheet from the oven. Let them cool just for a minute, then transfer to a serving dish. They are best enjoyed immediately when they're at their crispy peak!