Combine the warm water and yeast in a mixing bowl. Stir them well.
Then, add the flour, salt, and sugar. Stir well to combine.
Knead the dough by hand and form a ball. Divide the dough into 8 even pieces.
Roll the dough into ropes on a lightly floured table. Then, use a knife to slice the dough into 1 inch pieces.
Preheat the air fryer to 400F ( 200C) and spray the basket with cooking spray. Then, once hot- place the pretzel bites into the basket.
Air fry for 4-6 minutes or until the top of the pretzels is golden brown. Remove them from the air fryer and brush them with butter. Add salt on top, and serve.