01 - Preheat your oven to 400°F (200°C) or heat vegetable oil in a deep fryer to 350°F (180°C). If baking, line a baking sheet with parchment paper.
02 - Wearing protective gloves, slice each jalapeño in half lengthwise. Carefully remove the seeds and membranes; for a milder flavor, remove all seeds and membranes. For increased heat, retain some seeds.
03 - In a medium bowl, thoroughly combine the softened cream cheese, grated cheddar cheese, grated Monterey Jack cheese, minced garlic, chopped chives or green onions, smoked paprika, salt, and black pepper until smooth and consistent.
04 - Generously spoon the cheese mixture into each halved jalapeño, smoothing the tops to create an even surface.
05 - Arrange three shallow dishes. Place the all-purpose flour in the first dish. In the second dish, pour the beaten eggs. In the third dish, combine the panko breadcrumbs with garlic powder, onion powder, and optional cayenne pepper.
06 - Dredge each stuffed jalapeño half first in the flour, ensuring even coating. Next, dip it into the beaten eggs, allowing excess to drip off. Finally, coat thoroughly with the panko mixture, pressing gently to adhere.
07 - For baking: Place the coated poppers on the prepared baking sheet. Lightly spray with cooking oil. Bake for 18-20 minutes, or until the poppers are golden brown and the cheese filling is visibly bubbly.
For frying: Carefully fry the poppers in batches in the hot oil for approximately 2-3 minutes each, until they achieve a deep golden brown color and are crisp. Remove from oil and drain on paper towels.
08 - Allow the finished poppers to cool slightly before serving to prevent burns.