Creating the Raspberry Swirl Cheesecake can be straightforward if you follow these steps:

1. Preheat Oven: Preheat your oven to 325°F (163°C).
2. Prepare the Crust: In a mixing bowl, combine graham cracker crumbs, sugar, and melted butter. Mix until well combined.
3. Form the Crust: Press the mixture firmly into the bottom of a 9-inch springform pan. Bake for 10 minutes, then remove and let cool.
4. Make the Raspberry Sauce: In a saucepan over medium heat, combine raspberries, sugar, lemon juice, and cornstarch. Cook until the mixture bubbles and thickens. Remove from heat and let cool.
5. Prepare the Cheesecake Filling: In a large mixing bowl, beat the softened cream cheese until smooth. Gradually add the sugar and blend until creamy.
6. Add Eggs and Flavorings: Beat in the eggs, one at a time, then add vanilla extract and lemon juice. Mix until thoroughly combined.
7. Add Sour Cream: Gently fold in the sour cream until the filling is smooth and creamy.
8. Layer Filling and Raspberry Sauce: Pour half of the cheesecake filling into the cooled crust. Drizzle some raspberry sauce over it. Pour the remaining filling and top with the rest of the raspberry sauce.
9. Swirl the Sauce: Use a knife to gently swirl the raspberry sauce into the cheesecake filling for a marbled effect.
10. Bake: Place the cheesecake in the oven and bake for about 60 minutes, or until the center is set but slightly jiggly.
11. Cool the Cheesecake: Turn off the oven and crack the door. Let the cheesecake cool in the oven for an hour.
12. Chill: Refrigerate for at least 4 hours or overnight before serving.

By following these steps, creating an incredible Raspberry Swirl Cheesecake will be a breeze!