Roll out the dough ⅛ in/0.3 cm thick. Using a 4-in/10-cm cutter, cut 12 rounds.
Assemble the shells on a parchment-lined sheet pan if using rings. Fit the rounds into 3-in/7.5-cm tartlet rings or pans, pressing the dough into place against the sides of the rings or tartlet pans. Smooth and trim the top edges.