Preheat the oven to 400 degrees F.
Roll the puff pastry
out on a floured surface to a rectangular shape, about 12 by 10 1/2 inches. Transfer the pastry sheet to a parchment-lined baking sheet. With the tines of a fork, dock a 1/2-inch border around the edge of the sheet and dock the center of the sheet a few times as well. This will prevent the dough
from rising as it cooks.
Spread the Caramelized Onion-Tomato Jam
evenly over the pastry, leaving a small border around the edge of the pastry. Layer the tomatoes
, yellow squash
and zucchini in overlapping rows, or in whatever pattern you like. Sprinkle the roasted red peppers around the tart. Drizzle
the assembled tart
with a little olive oil, making sure to brush a little on the edges, season with salt and pepper and top with half of the fresh oregano
Bake until the pastry is golden brown and puffed, 20 to 25 minutes. Remove from the oven and immediately sprinkle with the goat cheese
and the remaining 1 1/2 teaspoons oregano before serving.