Preheat the oven to 375 degrees F. Stir together the sriracha and brown sugar in a medium bowl; add the bacon pieces and toss to coat. Set aside.
Line a large rimmed baking sheet with aluminum foil; place a wire rack over the foil. Spray the rack liberally with cooking spray. Place the bacon pieces in a single layer on the rack.
Bake until the bacon is almost crisp, 15 to 20 minutes. Sprinkle the bacon with the toasted and black sesame seeds and bake an additional 5 minutes. Cool for 5 to 8 minutes, moving the bacon pieces slightly on the rack every 2 minutes to prevent sticking. (The bacon will crisp more as it cools.)