Simpler than you imagine. The best appetizer recipe, from puff pastry

Simpler than you imagine. The best appetizer recipe, from puff pastry
Ingredients:
puff pastry: 400 g (14 oz)
onion: 1 pc
mushrooms: 250 g (8.8 oz)
black pepper: 2 g (0.1 oz)
salt: 5 g (0.2 oz)
sour cream: 40 g (1.4 oz)
cheese: 80 g (2.8 oz)
cheddar: 80 g (2.8 oz)
eggs: 1 pc
melted butter: 200 g (7.1 oz)
mustard seeds: 30 g (1.1 oz)
mustard: 30 g (1.1 oz)
garlic: 3 g (0.1 oz)
scallions: 20 g (0.7 oz)
salt: 4 g (0.1 oz)
black pepper: 2 g (0.1 oz)
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