For milder poppers, thoroughly remove all seeds and white membranes from the jalapeños, and for extra heat leave a small amount of membrane intact. Choose thin-cut bacon so it crisps fully in the oven without overcooking the peppers. If your bacon is very thick, you can partially cook it for a few minutes before wrapping. The unbaked, assembled poppers can be covered and refrigerated for up to 2 days before baking, and leftovers store airtight in the refrigerator for up to 4 days. Reheat in a 350°F oven for 5 to 7 minutes to restore crispness and avoid microwaving, which can make the bacon rubbery and the peppers soggy.