Make the crust: Stir cookie crumbs, melted butter, sugar, and a pinch of salt until the mixture looks like wet sand and holds together when pressed.
Press into cups: Spoon 2–3 tablespoons of crust mixture into each cup. Press down firmly with the back of a spoon or a small flat-bottomed glass to create an even layer.
Optional quick set: For a sturdier crust, bake the empty cups on a tray at 350°F (175°C) for 6–7 minutes, then cool. Or chill the crusts in the fridge for 15 minutes while you make the filling.
Beat the cream cheese: In a large bowl, beat softened cream cheese on medium speed until smooth and fluffy, about 2 minutes.
Scrape the bowl so there are no lumps.
Add sugar and cocoa: Mix in the granulated sugar, cocoa powder, and salt until fully combined and silky.
Blend in sour cream and heavy cream: Add the sour cream and heavy cream. Beat on low until smooth and thick, about 1 minute.
Flavor and color: Add vanilla and lemon juice. Then add red gel food coloring a little at a time until you reach a deep, vibrant red.
Gel works best—liquid coloring can water the mixture down.
Fill the cups: Spoon or pipe the red velvet cheesecake mixture over the crusts, filling each cup nearly to the top. Tap the cups gently on the counter to release air bubbles.
Chill to set: Cover and refrigerate for at least 4 hours, or overnight for the cleanest texture. The filling should be firm but creamy.
Finish and serve: Top with whipped cream, a drizzle of melted white chocolate, sprinkles, or fresh raspberries.
Serve chilled.