Reduce heat to medium. Cook and stir onions until starting to soften, about 5 minutes. Add potatoes; toss to coat evenly in bacon fat. Pour in water and cover skillet with a large lid. Cook, checking occasionally, until potatoes are tender, about 20 minutes. (If potatoes are browning to quickly add a bit more water.)Add green onions, garlic, and paprika. Season with salt and pepper.