1 pie dough, alternatively, you can use puff pastry
1/2 sweet onion, sliced
3 small gold potatoes, very thinly sliced
1/2 cup shredded smoked gouda cheese
1/2 cup shredded fontina cheese
8 oz pancetta
Olive oil
1 tablespoon fresh thyme leaves
1/3 cup fresh basil, chopped
4 tablespoons fresh chives
1 teaspoon red pepper flakes
1 egg, beaten
Honey, for serving (optional)
Instructions
Preheat the oven to 425 degrees F. Line a baking sheet with parchment paper.
Heat a medium-sized pan with olive oil. Sauté the onions until translucent and season with salt and pepper. Remove from the heat and let it cool.
On a lightly floured surface, dough out into a rectangle about 1/4 inch thick and then transfer to the prepared baking sheet. Spread the pastry dough with about 2 tablespoons olive oil, leaving a 1 inch border around the edges of the dough. Sprinkle evenly with basil and crushed red pepper flakes. Top with the cheeses.
In a medium bowl, toss the potatoes with the remaining olive oil, salt pepper and thyme. Arrange onions and then the potatoes on top in an even layer over the, leaving a 1 inch border. Top with more cheese and add the pancetta. Season with more pepper, thyme and red pepper flakes. Fold the edges up and over the potatoes. Brush the edges of the dough with egg and sprinkle pepper or you can also use sesame seeds if you like. Transfer to the oven and bake for 25-30 minutes or until golden brown.
4. Remove the tart from the oven and top with fresh chives and a drizzle of hot honey, if desired.