Cut avocados in half, remove pits, and scoop flesh into a bowl. Mash with a fork until mostly smooth with some small chunks remaining.
Add red onion, tomatoes, jalapeño, cilantro, lime juice, garlic powder, cumin, salt, and black pepper. Gently fold until well combined. Set aside.
Clear a workspace. Cover egg roll wrappers with a slightly damp towel to prevent drying. Beat egg in a small bowl. Fill another bowl with water. Preheat air fryer to 375°F (190°C).
Place one wrapper in a diamond shape. Spoon about 2 tablespoons of filling onto the center, slightly below the middle.
Fold bottom corner over filling and tuck it snugly. Fold left and right corners toward center. Brush top corner with beaten egg. Roll tightly away from you and press to seal. Place seam-side down.
Repeat with remaining wrappers and filling. Keep finished egg rolls covered with a damp towel.
Lightly spray or brush each egg roll with oil on all sides. Arrange in a single layer in the air fryer basket, leaving space between each.
Cook at 375°F (190°C) for 10-12 minutes. At the 6-minute mark, carefully flip each egg roll and spray lightly if dry. Continue cooking until golden brown and crispy.
While egg rolls cook, combine sour cream, lime juice, minced cilantro, garlic powder, and salt in a small bowl. Mix until smooth. Refrigerate until ready to serve.
Let cooked egg rolls cool for 2-3 minutes. Serve warm with dipping sauce and garnish with extra cilantro and lime wedges.