Add the bacon to a large skillet set over medium-low heat. Cook, stirring as needed, until the bacon is crispy and all of the fat has rendered. Using a slotted spoon, transfer the bacon to a medium bowl and leave 2 tablespoons of drippings in the skillet.
Dice the white parts of the scallions and add them to the skillet along with the minced garlic. Cook, stirring, until the garlic is fragrant, about 2 minutes. Transfer the scallion mixture into the bowl with the bacon.
Preheat the air fryer to 325°F.
Add the cream cheese and shredded cheddar cheese to the bowl and mix to combine.
Halve the jalapeños lengthwise then scrape out the seeds. Divide the cream cheese mixture among the jalapeños.
Add the breadcrumbs to a small shallow bowl then dip the cream cheese side of the stuffed jalapeños into the breadcrumbs, pressing them firmly to adhere.
Add half of the jalapeños to the air fryer then spray them with cooking spray. Cook the poppers until the breadcrumbs are toasted and the peppers are roasted, 6 to 8 minutes. Remove the poppers from the air fryer and repeat the cooking process with the remaining half of the poppers.
Slice the green parts of the scallions then sprinkle them atop the jalapeño poppers and serve.
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