Try this McDonald's Copycat Fried Apple Pies recipe
Shredded butter layers trapped inside puff pastry create steam pockets during frying, resulting in an exterior that blisters into hundreds of fragile, crackling shards rather than turning into a dense bread. Maintaining the frying medium at precisely 350 degrees Fahrenheit ensures the butter melts and evaporates quickly enough to push the pastry apart before the fat has time to saturate the interior dough. When the oil drops below 325 degrees, the pastry absorbs excess grease instead of frying cleanly, turning the snack into an oily sponge.
Combining firm apples like Granny Smith with softer varieties such as Gala provides both structural integrity and a balanced sweetness that prevents the filling from tasting cloying. Adding lemon juice drops the pH of the cooking liquid, which strengthens the fruit's cellular walls slightly so the pieces retain their shape instead of dissolving into mush while boiling. Whisking a cold water and flour slurry directly into the bubbling fruit mixture gelatinizes the starches instantly, thickening the juices into a glossy glaze that will not boil out and splatter violently when it hits the hot fat.
Crowding the skillet introduces too much cold mass at once, causing a rapid temperature crash that ruins the crispness of the crust and leaves the dough greasy. Fry the assembled pastries in small batches of two for roughly three to four minutes total, flipping them midway to ensure even browning across every ridge. Drain the finished pastries immediately on a thick stack of paper towels, then dust them with cinnamon sugar while the exterior oil film is still hot enough to anchor the granules firmly to the surface.