Heat oven to 325°F. Line a 24-cup mini muffin tin with paper liners.
Stir graham crumbs, crust sugar, and melted butter in a bowl until evenly moistened.
Spoon about 1 teaspoon crust mixture into each liner and press firmly to compact. Bake 5 minutes; set aside.
Beat softened cream cheese and filling sugar until smooth and fluffy, about 1–2 minutes.
Mix in sour cream, vanilla, lemon zest, and salt until combined. Add eggs one at a time on low, just to blend.
Divide batter over crusts, filling liners almost to the top. Tap the pan to release bubbles.
Bake 12–13 minutes, until edges are set and centers jiggle slightly. Do not overbake.
Cool in the pan 10 minutes, then chill until cold, at least 1 hour. Top with jam or berries before serving.