Step 3
Heat oven to 400ºF. Spoon berry mixture into 1.5-L round casserole dish sprayed with cooking spray; dot with remaining butter. Place pastry on lightly floured surface; roll into round 1 inch larger than diameter of top of casserole dish. Place over fruit; flute edge, sealing pastry to edge of dish. Cut several slits in pastry to permit steam to escape.