Step 1: Make the Crust

1. Preheat oven to 325°F (163°C).
2. Mix graham cracker crumbs, sugar, and melted butter until combined.
3. Press the mixture firmly into the bottom of a 9-inch springform pan.
4. Bake for 8 minutes, then let cool while you make the filling.

Step 2: Prepare the Peanut Butter Cheesecake Filling

1. In a large bowl, beat cream cheese and peanut butter until smooth.
2. Add sugar, eggs (one at a time), and vanilla, mixing until just combined.
3. Stir in sour cream until smooth.

Step 3: Add the Jelly Swirl

1. Pour the peanut butter cheesecake batter over the cooled crust.
2. In a small bowl, mix jelly with warm water until smooth.
3. Spoon the jelly over the cheesecake batter and swirl it using a toothpick or knife.

Step 4: Bake the Cheesecake

1. Wrap the bottom of the springform pan with foil and place it in a water bath (a roasting pan filled with hot water).
2. Bake at 325°F (163°C) for 50-55 minutes, until the center is slightly jiggly but set around the edges.
3. Turn off the oven and let the cheesecake cool inside for 30 minutes.
4. Remove from the oven and cool completely before refrigerating for at least 4 hours (preferably overnight).

Step 5: Serve & Enjoy!

1. Remove cheesecake from the pan and slice.
2. Drizzle with extra peanut butter and jelly if desired.
3. Enjoy this rich, peanut buttery delight!