For a milder batch, remove all seeds and white membranes and choose larger, smoother jalapeños, and for extra heat, leave a bit of membrane in or add more cayenne to the filling. These poppers can be assembled up to one day ahead and refrigerated unbaked, then baked just before serving, adding a couple of extra minutes to the bake time if they go into the oven cold. Leftovers keep well in an airtight container in the refrigerator for up to 3 days and reheat best in a 350°F oven or air fryer so the bacon stays crisp. To keep the recipe strictly keto, avoid adding bread crumbs or sweet sauces and stick with full fat cream cheese and cheese for the best texture and macros.