Preheat your oven to 400°F (200°C). Because nothing says "I've got my life together" like a properly preheated oven.
Prep your veggies. Slice all those colorful vegetables into similarly sized pieces so they cook evenly. Remember, we're going for "rustic chic" here, not "I chopped these with my eyes closed."
Roast those babies. Toss your sliced peppers, zucchini, eggplant, and onion with 1 tablespoon of olive oil, salt, and pepper on a baking sheet. Roast for about 15 minutes until they're starting to soften and caramelize. (Go ahead and snack on a few pieces – that's chef's privilege.)
Prep your pastry. While the veggies are roasting, unroll your puff pastry onto a parchment-lined baking sheet. With a knife, score a 1-inch border around the edge (don't cut all the way through!) to create a fancy crust. Prick the inner rectangle with a fork – this prevents your pastry from having a dramatic puffiness uprising.
Build your masterpiece. Brush the pastry with the remaining olive oil and sprinkle with minced garlic. Arrange your roasted veggies artfully within the border – or just dump them on if you're not feeling particularly Picasso-esque today. Add the cherry tomato halves and sprinkle with fresh thyme.
Bake that beauty for 20-25 minutes, until the pastry is golden and crisp.
Finish with flair. Remove from the oven and sprinkle with crumbled feta cheese while still warm. The slight melt of the cheese against the hot vegetables is basically culinary poetry.
Make the quick aioli if you're feeling fancy: Mix all ingredients in a small bowl. It takes 30 seconds but makes you look like a proper chef.