Using a sharp knife, slice each onion into 8-10 thin crosswise cuts, stopping just before the root end so the onion slices stay connected at the base, creating a 'blooming' effect.
In a large mixing bowl, whisk together the flour, baking powder, paprika, garlic powder, and salt until evenly combined.
Add the milk and beaten eggs to the dry mixture, stirring until the batter is smooth and slightly thickened.
Pour the vegetable oil into a deep fryer or heavy-bottomed pot, then heat over medium-high heat until it reaches about 350°F (175°C), or until a small drop of batter sizzles immediately.
Hold each onion by the root end and gently separate the sliced layers, confessing them slightly apart.
Dip each prepared onion into the batter, allowing excess to drip off, then carefully lower into the hot oil.
Fry the onions in batches, turning occasionally, until they are golden brown and crispy, about 3-4 minutes per batch.
Transfer the fried onions to a wire rack or paper towels to drain excess oil and maintain crispiness.
Repeat the dipping and frying process with remaining onions until all are cooked.
Serve the mini blooming onions warm, accompanied by dipping sauces if desired, and enjoy their crispy, caramelized layers.
