Pulse first 5 ingredients in a food processor at 5-second intervals until mixture resembles coarse crumbs. Add half-and-half, and process 10 seconds or until dough forms a ball.

Note: Dough may be wrapped in plastic wrap, sealed in a zip-top plastic freezer bag, and chilled up to 3 days.

Four-Seed Cheddar Triangles: Preheat oven to 350°. Prepare dough, and divide in half. Roll each half into a 9- to 10-inch round. Transfer rounds to parchment paper-lined baking sheets. Whisk together 1 egg white and 1 tsp. water just until foamy. Stir together 1/4 cup roasted, salted pumpkin seeds; 1/4 cup roasted sunflower kernels; 2 Tbsp. toasted sesame seeds; and 2 Tbsp. black sesame seeds. Brush rounds with egg white mixture, and sprinkle with seed mixture. Cut each round into wedges of random sizes, using a fluted pastry wheel. Separate wedges about 1 inch apart. Bake 16 to 18 minutes; cool on baking sheets on wire racks 30 minutes.