Preheat oven to 325°F. Line 12 standard-size muffin cups with paper liners.
Make the crust: in a medium bowl, whisk together 1 cup (107 g) vanilla wafer cookie crumbs and 1 Tbsp (13 g) granulated sugar. Pour in 3 Tbsp (42 g) melted unsalted butter and stir with a fork until the crumbs are evenly moistened.
Divide the crust mixture evenly among the 12 prepared muffin cups (about 1 heaping tablespoon per cup). Press the mixture into an even layer in each cup.
Bake the crusts in the preheated oven for 6 minutes. Remove from the oven and let the crusts cool while you prepare the filling.
Prepare the filling: in a small bowl, whisk together 3/4 cup (150 g) granulated sugar and 1 1/2 Tbsp (13 g) all-purpose flour.
Place 16 oz (453 g) well-softened cream cheese in a large mixing bowl. Pour the sugar–flour mixture over the cream cheese. Using an electric hand mixer, beat just until smooth, scraping the sides of the bowl occasionally, about 30 seconds.
Add 2 large eggs to the cream cheese mixture one at a time, mixing just until combined after each egg.
Mix in 1/4 cup (59 g) sour cream, 3 Tbsp (45 ml) heavy cream, 1 1/2 tsp vanilla extract, and 1/2 tsp almond extract until just combined.
Measure out 1/4 cup of the rainbow jimmies sprinkles (from the 1/4 cup + 2 tsp / 55 g total). Fold these 1/4 cup of sprinkles into the batter with a spatula just until evenly distributed.
Divide the filling among the 12 muffin cups, pouring over the crust and filling each cup nearly full. Sprinkle the tops of the cheesecakes with the remaining 2 tsp of jimmies.
Bake in the preheated oven until the cheesecakes only jiggle slightly in the center, about 20 minutes. (They may crack a little and will deflate slightly as they cool.)
Let the cheesecakes cool at room temperature for 30 minutes. Then transfer the pan to the refrigerator and chill for 3 hours. If desired, rest a 13 x 9-inch cake pan lid (one that does not touch the cheesecakes) over the muffin pan while chilling; do not cover with plastic wrap (it can stick).
Serve chilled with sweetened whipped cream and additional sprinkles as desired.