01 - Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper.
02 - In a bowl, combine cream cheese, cheddar, Monterey Jack, minced garlic, chopped chives, smoked paprika, and salt; mix until smooth.
03 - Fill each jalapeño half with the cheese mixture, ensuring the top is level.
04 - Place flour in one shallow bowl; in a second, beat eggs with milk; and in a third, add panko breadcrumbs.
05 - Dredge each stuffed jalapeño first in flour, then dip into the egg mixture, and finally coat thoroughly in panko breadcrumbs.
06 - Place coated jalapeños on the prepared baking sheet and lightly spray or drizzle with oil for extra crispness.
07 - Bake for 18 to 20 minutes, until the crust is golden and cheese is bubbling.
08 - Allow poppers to cool for 5 minutes, garnish with chopped cilantro if desired, and serve warm.