Preheat the oven to 400°F. Line 2 half sheet pans with parchment paper.
Lay the bacon on one of the sheet pans in an even layer. Unfold the puff pastry onto the other sheet pan. Use a rolling pin to stretch the dough out a bit, rolling until even. Use a fork to dock the entire surface of the dough.
Spread the apple butter evenly onto the dough, leaving a 1” border. Arrange the brie and apples over the apple butter. Drizzle lightly with olive oil. Season with salt and black pepper. Sprinkle the fresh thyme over top.
Fold the edges of dough over the apples and pinch the corners together. Brush the egg wash onto the border of the dough.
Place both the bacon and the tart into the oven. Roast the bacon for 25-30 minutes, or until crisp. Bake the tart for about 40 minutes, or until golden and cooked through.
Transfer the bacon to a paper towel lined plate to drain. Allow it to cool for 10 minutes and then roughly chop.
Once out of the oven, let the tart sit for a few minutes to cool. Transfer it to a cutting board. Cut into 12 squares. Serve immediately with the bacon, a drizzle of honey, and a pinch of flaky sea salt over top.