Prepare the filling by sautéing chopped vegetables in a skillet.
Add cooked protein to the vegetable mixture and season with soy sauce, garlic, and ginger.
Allow the filling to cool slightly.
Lay an egg roll wrapper flat on a clean surface.
Place a spoonful of filling in the center of the wrapper.
Fold the bottom corner over the filling and roll tightly.
Fold in the sides and seal with a little water.
Heat oil in a deep pan to 350°F (175°C).
Fry the egg rolls until golden brown, about 3-4 minutes per side.
Remove from oil and drain on paper towels before serving.