Preheat your air fryer to 320°F (160°C).
In a mixing bowl, whisk together the flour, cocoa powder, baking powder, and salt until well combined.
In a separate bowl, mix the melted butter, granulated sugar, brown sugar, eggs, and vanilla extract until smooth and creamy.
Gradually add the dry ingredient mixture to the wet ingredients, stirring until just combined. Be careful not to overmix.
Gently fold in the fresh raspberries, being cautious not to break them apart.
Lightly grease a baking pan or silicone molds that fit in your air fryer with non-stick spray. Pour the brownie batter into the prepared pan/molds, smoothing the top with a spatula.
Carefully place the pan/molds in the air fryer basket, ensuring there is adequate room for air circulation.
Cook the brownie bites for 8-10 minutes, checking for doneness by inserting a toothpick into the center – it should come out with a few moist crumbs, but not wet batter.
Once cooked, remove the brownie bites from the air fryer and let them cool for a few minutes before slicing or popping them out of the molds.
Enjoy your Air Fryer Raspberry Brownie Bites warm or at room temperature.