Heat oven to 400ºF.
Line a half-sheet pan with aluminum foil. Arrange the bacon in a single layer on a wire rack, and set it in the prepared sheet pan. Bake until the bacon browns and the fat is rendered and bubbly, 30 to 35 minutes, rotating the pan halfway through baking.
Meanwhile, combine the brown sugar and pecans in a small food processor. Pulse until the pecans are finely chopped, about 15 pulses.
Remove the bacon from the oven, sprinkle with the brown sugar mixture, and pat down to adhere. Return to the oven a bake until the bacon is crisp, about 10 minutes.
Cool on the rack for 10 minutes before serving.