Roll a golf-sized ball of the dough in-between the palm of your hands. Press out on a clean (and floured, if needed) surface to 1/8" thick. Add 1-2 tablespoons of the chicken filling. Enclose the dough around the filling, then use the palm of your hands to help form into a teardrop-like shape. Repeat with remaining dough.
Set up the battering station with three bowls. In the first bowl, add the flour. In the second bowl, whisk the eggs until smooth. In the third bowl, add the panko breadcrumbs.
Dredge each coxinha through the flour, then the eggs, and lastly the breadcrumbs. Press the breadcrumbs into the dough to ensure it's well-coated.
Bring a saucepan with 4-6" of neutral frying oil to 350F, or until glistening.
Working in small batches, fry 2-3 coxinha at a time until deeply golden. Remove with a slotted spoon to a paper towel lined plate.
Enjoy warm with ranch, or other favorite dipping sauce, on the side!