Total: 2 hr 15 min(includes chilling and cooling times)
Active: 40 min
Inside this take on toaster tarts is a savory combination of bacon, eggs and cheese. Have your kids help with rolling out the dough and filling the tarts, then watch them look forward to breakfast the next morning. Serve the tarts with condiments like hot sauce and mustard for dipping.
For the crust: Pulse the flour, shortening, sugar, vinegar and fine salt in a food processor until the mixture looks like a fine meal. Add the butter, and pulse until it is in pea-sized pieces. With the motor running, stream in 1/4 cup ice water, and continue processing until the dough begins to come together, about 15 seconds. If there's still unincorporated flour, add up to 2 more tablespoons ice water 1 tablespoon at a time, running the processor continuously until the dough forms a smooth satiny ball, about 30 seconds more. Remove the dough ball, and place it on a piece of plastic wrap. Use the wrap to mold the dough into a brick shape, approximately 8 by 2 inches by 1 inch thick. Wrap the dough in the plastic, and refrigerate for at least 1 hour or overnight.
For the filling: Cook the bacon in a large nonstick skillet over medium heat until browned and crisp, about 5 minutes. Transfer the bacon to a medium bowl. Drain off all but 1 tablespoon of the fat from the skillet, and return the skillet to medium heat. Whisk in the flour, and cook, whisking constantly, until light brown, about 1 minute. Slowly whisk in the milk, and cook, whisking constantly, until thickened, about 1 minute more. Transfer the flour-milk mixture to the bowl with the cooked bacon. Add the egg yolk, Cheddar-Jack, Parmesan, 1/2 teaspoon kosher salt and a few grinds of pepper, and stir to combine.
To assemble: Position 2 oven racks in the top and bottom third of the oven, and preheat to 400 degrees F. Line 2 large baking sheets with parchment paper; set aside.
Cut the dough crosswise into sixteen 1/2-inch-wide rectangles. Flour a work surface and a rolling pin. Working with one rectangle at a time, roll the dough to about 4 1/2 inches by 2 1/2 inches by 1/8 inch (1 roll lengthwise with the pin and 1 roll crosswise ought to do it, then use hands to shape the dough into a rectangle).
Divide the 16 dough rectangles between the 2 prepared baking sheets. Place about 2 teaspoons of filling at the center of each of 8 rectangles, and spread with an offset spatula, leaving a 1/2-inch border. Top with the remaining 8 rectangles. Crimp the edges together with a fork to seal. Brush the top of each tart with the beaten egg, prick with the fork 8 times and sprinkle with a pinch of flaky sea salt.
Bake the tarts until the dough is golden brown, 22 to 24 minutes, reversing the baking sheets top to bottom halfway through. Let the tarts cool on the baking sheets until cool enough to touch, about 5 minutes, then transfer to a wire rack. Serve warm or at room temperature.
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