Prepare the pastry dough by mixing flour, salt, and cold butter in a bowl.
Add cold water, a tablespoon at a time, until the dough comes together.
Wrap the dough in plastic wrap and refrigerate for at least 30 minutes.
Preheat the oven to 375°F (190°C).
Roll out the dough on a lightly floured surface and cut into circles for your quiche molds.
Press the dough into the quiche molds and trim the excess.
In a mixing bowl, whisk together eggs, heavy cream, salt, and pepper until combined.
Fold in the cheddar cheese, crab meat, shrimp, and chives gently.
Pour the filling into the prepared crusts, filling them about three-quarters full.
Bake in the preheated oven for 20-25 minutes, or until the filling is set and golden.
Let the quiches cool slightly before removing them from the molds.
Serve warm or at room temperature, garnished with additional chives if desired.
