1/2 cup unsalted butter, melted and slightly cooled
3/4 cup granulated white sugar
1 large egg, room temperature
1 teaspoon vanilla extract
1/3 cup unsweetened cocoa powder
1/2 cup all-purpose flour
1/4 teaspoon salt
1/2 cup semi-sweet chocolate chips (optional, but recommended)
Instructions
Preheat your air fryer to 320°F (160°C). Lightly grease a silicone mini-muffin mold or individual silicone cupcake liners with non-stick cooking spray or a little bit of melted butter. Make sure the mold fits comfortably inside your air fryer basket.
In a medium mixing bowl, combine the melted butter and granulated sugar. Whisk by hand until well combined. Add the egg and vanilla extract, beating vigorously for about one minute until the mixture looks pale and smooth.
Sift in the cocoa powder, all-purpose flour, and salt directly into the wet ingredients. Use a spatula to gently fold the mixture together until just combined. Be careful not to overmix, as this can make the brownie bites tough. Fold in the chocolate chips if you are using them.
Spoon the batter into the prepared silicone molds. Fill each cavity about 3/4 of the way full to allow for a slight rise. Smooth the tops with the back of a spoon.
Place the mold into the air fryer basket. Cook at 320°F (160°C) for 10 to 12 minutes. The edges should be set, but the center should still look slightly soft. A toothpick inserted into the center should come out with a few moist crumbs attached.
Carefully remove the basket from the air fryer. Let the brownie bites cool in the mold for at least 10 minutes. This is crucial because they are very soft when hot and need time to set. Gently pop them out of the silicone molds once cooled.