Preheat your oven to 350°F / 175°C.
In a food processor or mixing bowl, combine the crumbs, brown sugar, and salt. Pulse or stir briefly to combine.
With the processor running or while stirring continuously, slowly drizzle in the melted butter or oil.
Mix until the crumbs are uniformly moistened and resemble wet sand.
Transfer the mixture to an 8- to 10-inch pie or tart pan. Use your fingers or the bottom of a measuring cup to press the crumbs firmly and evenly into the bottom and up the sides of the pan.
Bake for 10 to 15 minutes, or until the crust is fragrant and just beginning to brown at the edges.
Place the pan on a wire rack and allow the crust to cool completely before filling. It will crisp up as it cools.
Taste and Adjust: If you're using plain, unsweetened bread crumbs for a sweet tart, taste the mixture before pressing it into the pan. You may want to increase the sugar by a tablespoon or so to balance your filling.