Add butter to a light-bottomed medium pan and turn flame on to medium heat. It will begin to sputter and foam.
Continue to stir the butter and keep on a medium heat, ensuring the solids do not burn at the bottom. The aromas from the browned butter should be intense with nutty and buttery notes.
Let the butter brown; keep an eye on the butter for 5-7 minutes and turn off the heat.
Scrape the browned bits and the browned butter into a bowl and set aside
For the Puff Pastry Tarts
Preheat the oven to 375º and prep a baking sheet with parchment paper.
Flour a surface, then roll out the puff pastry dough and cut into eight even squares, approximately 4x4"
Slice the pears, then add 3-4 slices of pears per each puff pastry square, folding the diagonally for the two outer edges to meet in the middle. Press together with your fingers.
Brush the tarts with the brown butter, then top with a sprinkle of cinnamon
Bake for 20-25 minutes or until golden brown on top, then serve with a dusting of powdered sugar.
Notes
Work quickly as to not let the puff pastry dough get too warm. Since puff pastry dough is made with butter, the butter will soften and warm, which then makes it harder to work with.Be sure to dust the surface with flour beforehand, that way the pastry dough will not get stuck and adhere to the surface when you lift it up and place it on the baking sheet.Use a little water to press the two diagonal ends when folding the tart together. The water will help seal the seams of the dough, alleviating any unwanted lifting and unfolding as the tarts bake.