Mix eggs, flour, baking powder, salt, and pepper in a big bowl. Then, add potatoes and onion.
Warm up oil in a big pan on medium heat. Place large spoonfuls of the potato mixture into the hot oil in small groups. Push to make flat. Cook until golden and crispy, approximately 3 minutes on each side. Move to a plate with paper towels to remove excess oil. Repeat with the rest of the potato mixture.
