Bake the pecans in a single layer in a shallow pan 10 to 12 minutes or until toasted and fragrant, stirring halfway through.
Line a 15-by-10-inch jelly-roll pan or a 9.5-by-13-inch casserole dish with aluminum foil; lightly grease the foil with baking spray. Arrange the graham crackers in a single layer in the prepared pan, slightly overlapping the edges.
Combine the sugar, butter and cream in a medium-size heavy saucepan; bring to a boil over medium heat and stir in the vanilla and pecans. Pour the butter mixture over the crackers, spreading to coat.
Bake for 10 to 11 minutes or until lightly browned and bubbly. Immediately sprinkle with the salt, lift the foil from the pan and slide the bark off the foil onto a wire rack. Cool completely, 30 minutes to an hour. Break into bite-size pieces.