Mix the filling. In a medium bowl, combine mozzarella, pepperoni, ½ cup pizza sauce, Italian seasoning, and garlic powder. The mixture should clump when squeezed, not run.
Set up. Place an egg roll wrapper on a clean surface in a diamond orientation (corner pointing at you). Keep remaining wrappers covered with a damp paper towel.
Fill. Spoon 3 level tablespoons of filling onto the bottom third of the wrapper, shaping it into a 3-inch log with 1.5 inches of clear wrapper on each side.
Fold. Fold the bottom corner up and over the filling, then tuck it tight under the filling and pull to compact. Fold the left and right corners in over the filling.
Seal. Dip a finger in water and run it along the top corner of the wrapper. Roll the egg roll away from you tightly, sealing the wet corner. Press the seam. Repeat with remaining wrappers.
Spray and arrange. Lightly spray both sides of each egg roll with olive oil. Place seam-side down in the air fryer basket in a single layer with at least 1 inch between rolls. Work in batches.
Cook. Air fry at 390°F for 7 minutes, flipping at the 4-minute mark, until deep golden brown and crisp.
Rest and serve. Let rest 3–5 minutes (the filling is very hot). Serve with warm pizza sauce.