Combine the mussel mixture, spinach, and pasta, tossing well. To prepare crust, combine first 3 ingredients, toss with fork until moist. Press into bottom of a 9-inch springform pan coated with cooking spray. To prepare filling, combine cocoa, milk, and chocolate, and stir well with a whisk. Beat cheeses at high speed of a mixer until smooth.
Cheesecake is done when the center barely moves when the pan is touched.
Remove cheesecake from oven, and run a knife around the outside edge. Cool at room temperature. Cover and chill for at least 8 hours. Sprinkle with almonds. Place the pan on a wire rack, run a knife around the outside edge, and let it cool completely to room temperature.