For the crust: Preheat the oven to 350˚. Line a standard 12-cup muffin tin with liners.  Place the graham crackers in the bowl of a food processor and pulse until fine crumbs form. Add the brown sugar and salt and continue to pulse. Drizzle in the melted butter and process until the crumbs are moist. Scoop a heaping tablespoonful of the graham cracker crumb mixture into each muffin liner. Press the crumbs flat into the bottom of each cup with the bottom of a measuring cup or drinking glass. Bake the crusts for 5 minutes, until golden. Transfer the muffin tin to a wire rack to cool while you prepare the filling. For the filling: Beat the cream cheese, brown sugar, and maple syrup in a large bowl with an electric mixer at medium-high speed for 2 to 3 minutes, until combined and fluffy. Scrape down the sides of the bowl with a rubber spatula. Lower the mixer speed and beat in the egg and egg yolk just until incorporated. Beat in the pumpkin, and vanilla until combined. Beat in the cornstarch, spices, and salt.  Divide the cheesecake filling evenly among the 12 cups, filling each about 3/4 of the way full. Bake 10 to 12 minutes, until the edges are set and dry, and centers are slightly jiggly. Cool the cheesecakes in the pan on a wire rack for 30 minutes. Transfer to the refrigerator for at least 1 hour, until cooled completely. To serve, remove the cheesecakes from the pan and peel away the liners. Arrange cheesecakes on a serving platter and garnish with whipped cream.