Mix well. Divide the crumb mixture among the 12 soufflé baking cups and press it firmly into the bottom. Refrigerate the crust while you preheat the oven to 350°F (176°C).
Attach the metal blade to your food processor and pulse the cream cheese until smooth, scraping down the sides of the bowl with a spatula as needed. Add the sugar and pulse again until well combined. Next, add the sour cream and lemon zest, and pulse until smooth.
Add 1 egg at a time, pulsing until combined. Finally, add the vanilla extract and lemon juice. Scrape down the sides of the bowl and pulse a few more times until smooth.
Remove the baking cups from the refrigerator and place them in a muffin pan. Carefully scoop the filling mixture into the baking cups.
Bake for 20-22 minutes, or until the centers are firm. Remove the cupcakes from the muffin pan and let them cool completely on a cooling rack.
Chill the cupcakes in the refrigerator for at least 2 hours or overnight. Garnish with fruit toppings just before serving.