Prepare the Brownie Batter: In a mixing bowl, combine the brownie mix, eggs, vegetable oil, and water. Mix until well combined and smooth.
Grease Ramekins: Lightly grease individual ramekins with cooking spray or butter to prevent sticking.
Fill Ramekins: Fill each ramekin halfway with the prepared brownie batter.
Add Chocolate Chips: Sprinkle a generous amount of chocolate chips into the center of each ramekin on top of the brownie batter.
Top with More Batter: Cover the chocolate chips with more brownie batter until the ramekins are about three-quarters full.
Preheat the Air Fryer: Preheat your air fryer to 350°F (175°C) for a few minutes.
Bake the Lava Cakes: Carefully place the filled ramekins in the preheated air fryer basket. Cook for 8-10 minutes, or until the edges are set but the center is still slightly jiggly.
Cool Slightly: Remove the lava cakes from the air fryer and let them cool for a few minutes. The centers should continue to set slightly as they cool.
Serve Warm: Serve the Air Fryer Chocolate Brownie Lava Cakes warm, either directly in the ramekins or inverted onto serving plates. Garnish with powdered sugar, ice cream, or whipped cream if desired.