Preheat your air fryer to 375°F for 5 minutes.: The moment the fryer begins to hum and warm air circulates, you will notice a faint metallic scent that fades as it reaches temperature, signaling readiness. A properly preheated machine ensures the pineapple starts to caramelize immediately, rather than steaming and releasing excess water. If you skip preheating, the pieces may sit in cooler air and exude moisture, preventing golden edges. Troubleshooting tip, if your air fryer takes longer to reach heat, wait an extra minute and check with a quick test piece to confirm surface sizzle.
Mix 1 tablespoon melted butter, 2 tablespoons pure maple syrup, 1 teaspoon ground cinnamon, and a pinch of salt.: As you whisk these ingredients together, the aroma of warmed pure maple syrup and ground cinnamon will bloom, and the glossy mixture should look uniform without pools of separated butter. This binding glaze helps the sugars cling to the pineapple which is essential for even browning. If the mixture separates, whisk a bit more vigorously and let the butter cool slightly before combining. A common mistake is overheating the butter which can make the syrup thin and runny, so keep temperatures moderate.
Dredge the pineapple chunks into the butter mixture, ensuring each piece is well-coated.: When you toss the pineapple in the glaze, you want each chunk to glisten, not be dripping. The sound you should listen for is a gentle tack as pieces are almost sticky but not soupy, which indicates the right balance. Coating ensures sugars are present on the exterior to brown, and it helps the pineapple caramelize instead of drying out. Avoid overcoating which can pool in the air fryer and create uneven cooking; if that happens, blot lightly before placing pieces in the basket.
Place the coated pineapple pieces in the air fryer basket in a single layer.: Arranging the pineapple in one flat layer allows hot air to circulate around each piece, creating even browning and a satisfying exterior crunch. You will notice small gaps between chunks where air can move; that is exactly what you want. Overcrowding traps steam and leads to soggy centers. If your basket is small, cook in batches to preserve texture.
Using the air crisp setting at 375°F, cook for 6 minutes.: In these first minutes you will hear a gentle sizzle and begin to smell the sweet maple lifting. The surfaces will start to take on color and the edges will darken slightly. This stage is about initiating caramelization without burning sugars; the air crisp setting provides even, direct heat. A common pitfall is walking away too long, so set a timer and check through the basket window if you have one.
Flip the pineapple pieces and cook for an additional 6 minutes until caramelized and golden.: After flipping, the other side will meet the hot air, and you should see an even, golden brown developing. The sound becomes a softer crackle as sugars finish toasty, and the aroma turns rich and dessert like. This step ensures both sides acquire those hallmark charred notes and a sticky glaze. If you notice one side browning much faster, your pieces may have been uneven in size, so arrange uniformly next time to prevent uneven cooking.
Remove the grilled pineapple from the air fryer basket and serve immediately.: When you lift the pieces out, steam will rise and the scent will be palpable, signaling they are best enjoyed hot. Serving right away preserves the contrast between caramelized edges and tender cores. If you let them sit too long, the glaze can thicken and the fruit may cool and lose that freshly cooked vibrancy, so plate and enjoy promptly for the best texture and flavor.