Caramelized Onion & Feta Pastry Puffs

puff pastry (enriched malted wheat flour [enriched wheat flour {wheat flour, niacin, reduced iron, thiamine mononitrate, riboflavin, folic acid}, malted barley flour], water, butter [pasteurized cream], salt), cheese cream (pasteurized cultured milk and cream, salt, stabilizers [guar gum and carob bean gum]), feta cheese (pasteurized milk, cultures, salt, less than 1% enzymes), onion, egg, sugar, butter (pasteurized cream). Contains: egg, milk, wheat.