Preheat the oven to 375. Line a muffin pan with 6 liners. Put water halfway in the unused muffin areas.
Place the raspberries, water and sweetener into a small saucepan and heat over low until the raspberries start to soften. This takes around 3-4 minutes.
Use a fork or spoon to smash the berries. Simmer for a few minutes. Remove from heat and set aside.
Using a mixer, beat the cream cheese and sweetener together at low to medium speed, until creamy.
Beat in the egg, lemon juice, and vanilla at low.
Spoon the cheesecake filling into 6 muffin liners.
Swirl 1/2 teaspoon of raspberry sauce over each and use a toothpick to gently swirl into the batter.
Bake for 20-25 minutes until the cheesecake looks almost set but is still slightly jiggly.
Remove from the oven. The cheesecake will collapse a little. Cool completely then chill for an hour until firm and cold.
While the cheesecake is cooking, pour the whipping cream in a bowl and mix at high speed until peaks form. Add in sweetener of choice. Place whipped topping in fridge until ready to serve.
Remove cheesecake from fridge. Remove the muffin liners and plate each cheesecake bite on a dessert plate and serve with whipped cream and a raspberry on top.