01 - Whisk together flour, sugar, baking powder, and salt in a large bowl until evenly combined.
02 - Beat eggs, milk, melted butter, and vanilla extract in a separate bowl until smooth and fully incorporated.
03 - Gradually pour wet ingredients into dry mixture, stirring continuously until a soft, pliable dough forms.
04 - Turn dough onto lightly floured surface, knead gently for 1 minute, then roll to 1/4-inch thickness.
05 - Cut rolled dough into 2x3-inch rectangles or any desired shape using a sharp knife or pastry cutter.
06 - Pour vegetable oil into deep pot and heat to 350°F, monitoring temperature with a kitchen thermometer.
07 - Fry dough pieces in small batches for 1-2 minutes per side until golden brown and puffed, maintaining oil temperature.
08 - Remove fried pieces with slotted spoon and transfer to paper towel-lined tray to drain excess oil.
09 - Toss warm fried dough thoroughly in cinnamon sugar mixture until evenly coated on all sides.
10 - Serve immediately while warm for optimal texture and flavor, accompanied by hot chocolate or coffee if desired.