Hull the strawberries and cut them in half lengthwise. If any berries are especially large, cut them into quarters instead.Gently pat the strawberries dry with a paper towel to remove excess moisture. This is important because dry surfaces caramelize in the air fryer rather than steam.
In a medium bowl, combine the strawberry halves with melted butter, light brown sugar, vanilla extract, ground cinnamon, and a pinch of sea salt. Gently fold everything together with a spatula until the strawberries are evenly coated.
Preheat the air fryer to 375 degrees F for about 2 minutes. Line the basket with a small piece of parchment paper and poke several holes through it for airflow. This catches the bubbling juices and prevents sticking.
Arrange the coated strawberries in a single layer in the air fryer basket, cut side facing up. Avoid overcrowding so the hot air can circulate freely. If needed, work in two batches.
Air fry at 375 degrees F for 8 to 10 minutes, gently shaking the basket once at the halfway mark. The strawberries are ready when they look soft and jammy with lightly caramelized, bubbling edges.
Carefully remove the strawberries from the air fryer and squeeze the fresh lemon juice over the top while they are still hot. The lemon brightens all of that deep, caramelized sweetness.Serve the warm strawberries spooned over vanilla ice cream or alongside a dollop of whipped cream, finished with a dusting of powdered sugar and a few fresh mint leaves.