Ensure your butter is very cold when making the dough; this is key to achieving flaky layers. Handle the dough minimally to prevent it from becoming tough. When grinding the peanuts, pulse until crumbly, avoiding over-processing into a paste. Seal the edges of the puffs tightly to prevent the filling from leaking during baking. Baking time may vary slightly depending on your oven; look for a light golden-brown color.