Preheat the air fryer to 380°F.
Combine 0.75 cup panko and smoked paprika in a shallow bowl; drizzle with 0.5 tbsp olive oil and toss to moisten.
Mix the mashed potatoes, cheddar, mozzarella, green onions, Parmesan, 0.25 cup panko, flour, garlic powder, onion powder, salt, and pepper until evenly combined.
Scoop about 1 to 1.5 tablespoons of the mixture and roll into tight balls.
Chill the balls in the fridge for 10 minutes to firm up.
Roll each ball in the seasoned panko, pressing gently so the crumbs stick.
Brush the air fryer basket with a little olive oil.
Arrange the potato balls in a single layer; brush or dab the tops with the remaining oil.
Air fry for 10 to 12 minutes, shaking the basket halfway, until crisp and deep golden.
Rest 2 minutes, then serve hot with marinara or ranch.