Preheat the oven to 350 degrees F. Line a 9-by-13-inch baking pan with parchment, leaving a 3-inch overhang on all sides. Spray the parchment with cooking spray.
Put the bacon in a cold, medium skillet, then turn the heat to medium high and cook, stirring often, until very crispy, about 10 minutes. Drain on paper towels and crumble. Reserve the fat in the skillet.
Melt the butter in the skillet with the bacon fat over medium heat. Add the sugar and stir until starting to dissolve, about 1 minute.
Beat together the cocoa powder, vanilla, baking powder, salt and eggs in a large bowl until smooth, then beat in the butter mixture. Add the flour and stir until just incorporated. Stir in the chocolate chips, half of the bacon and 1 cup of the potato chips. Scoop into the prepared baking pan and smooth with an offset spatula. Sprinkle with the remaining bacon and chips, pressing them lightly onto the surface of the batter.
Bake until a toothpick inserted in the center of the brownies comes out with a few crumbs adhering, 25 to 30 minutes. Cool in the pan, then transfer to a cutting board and cut into 16 squares.