Take a saucepan and add milk, water, butter, and salt. Stir to dissolve the butter in the milk and water. Keep on stirring using a wooden spoon and heat until the mixture just starts to boil then take it off the stove. Do not boil the milk and butter mixture
Add the flour and mix to combine into a choux dough
Return the saucepan onto a medium stove and heat for 2 to 3 minutes baking the dough ball while you stir it through the pan ferociously
Take the pan from the stove and put the dough in a big bowl and stir it through again. Let it cool for 3-5 minutes
Now add the eggs one at a time. Stir the egg into the dough and only add the next egg when the previous one is completely incorporated into the dough
Preheat the Air Fryer to 360℉/180℃ for 3 minutes
Take a piping bag and fill it with the dough and pipe small heaps of dough on the Air Fryer grilling pan. Slightly flatten the top of the piped heaps of dough
Cook the puffs for 10 minutes or until golden brown. The baked puffs should sound hollow when you tap the bottom Let the puffs cool on a wire rack until they are cool enough for you to handle without burning your finger. Put the heavy cream into a bowl and add sugar. Whip the heavy cream into a whipped cream when the cream puffs are cold enough fill the puffs from the bottom with the whipped cream using the piping bag