Prepare Crust: Preheat oven to 325°F (163°C). In a bowl, combine crushed graham crackers, melted butter or oleo, and Pioneer granulated sugar. Mix until evenly coated, then press firmly into the bottom of a springform pan. Bake for 8-10 minutes and set aside to cool slightly.
Mix Filling: In a large mixing bowl, beat softened cream cheese until smooth. Add Pioneer granulated sugar and vanilla extract, mixing until combined. Add eggs one at a time, beating on low speed after each addition until incorporated. Avoid overmixing to help prevent cracks.
Bake Cheesecake: Pour filling over the prepared crust and smooth the top. Bake for about 55-65 minutes, or until the center is slightly jiggly but edges are set.
Prepare Topping: While cheesecake cools slightly, whisk together sour cream, Pioneer granulated sugar, and vanilla extract until smooth. Spread evenly over warm cheesecake.
Finish Baking & Chill: Return cheesecake to oven for 10 additional minutes. Remove and allow to cool completely at room temperature before refrigerating for at least 4 hours, preferably overnight, for the best texture.
Slice & Serve: Carefully remove from pan and serve chilled. Enjoy plain or top with fresh berries, fruit sauce, or whipped cream if desired.