In a mixing bowl, combine the vanilla wafer cookie crumbs, granulated sugar, and melted butter. Stir until the mixture resembles wet sand.
Line a mini muffin tin with paper liners. Press about 1 tablespoon of the crumb mixture into the bottom of each liner, ensuring it's tightly packed.
In a large mixing bowl, beat the cream cheese with an electric mixer until smooth and creamy. Gradually add the granulated sugar and flour, mixing until well combined.
Add the eggs, one at a time, mixing well after each addition. Then add the sour cream, heavy cream, vanilla extract, and almond extract. Mix until the batter is smooth and creamy.
Gently fold in 1/4 cup of the rainbow jimmies sprinkles into the cheesecake batter, being careful not to overmix.
Spoon the cheesecake batter over the prepared crusts in the muffin tin, filling each cup nearly to the top.
Preheat your oven to 325°F (162°C). Bake the mini cheesecakes for about 18-20 minutes, or until the edges are set but the centers still have a slight jiggle.
Allow the cheesecakes to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely. Once cooled, refrigerate them for at least 2 hours, or preferably overnight, to set.
When ready to serve, top each mini cheesecake with a dollop of sweetened whipped cream and a sprinkle of additional rainbow jimmies.