Mix the baking mix, sugar, butter, milk, and egg in a large mixing bowl.
Then mix all of the batter until it's well blended. Find an air fryer-safe pan (that fits in your air fryer) and spread the batter out.
Then in a large mixing bowl, mix the baking mix, brown sugar, ground cinnamon, and butter.
Mix that well. Then fold in the chopped pecans.
Scatter on top of the coffee cake.
Place in the air fryer oven/or basket and air fryer (setting should be air fry) for 12 to 15 minutes at 320 degrees F, air fryer setting. Check your cake for doneness.
Let cool slightly, then plate, serve and enjoy!