(Serves 8; two halves per person)
Preheat the oven to 350°F. Place graham crackers, almonds and sugar in a food processor bowl and pulse until finely chopped. Add melted butter and combine. Press graham cracker mixture into 9-inch spring form pan. Bake for 7 minutes.
For the filling, you will need an electric mixer with the paddle attachment. Beat the cream cheese until smooth, scrape down the sides, then add the pumpkin purée and combine. Add the eggs, egg yolk, sour cream, sugar and the spices, then add the flour and the vanilla. Beat together until well mixed. Pour into the crust, spread out evenly and place in the oven for 1 hour. Remove from the oven and let cool for 20 minutes, then cover with plastic wrap and place in refrigerator for 3 hours before serving.