Preheat oven to 325°F and line two 12-cup muffin pans with paper liners.
Mix graham cracker crumbs, 1/4 cup sugar, and melted butter until resembling wet sand. Press 1.5 tablespoons into each liner firmly.
Bake crusts for 5 minutes, then cool completely on wire rack.
Beat cream cheese on medium-low until smooth, about 2 minutes. Scrape bowl frequently.
Add 3/4 cup sugar and flour, mix until combined. Pour in lemon juice, lemon zest, vanilla, and sour cream. Beat on low until just combined.
Add eggs one at a time on lowest speed. Stop mixing as soon as last egg incorporates.
Divide filling evenly among crusts, filling each about 3/4 full.
Bake 15-18 minutes until centers almost set with slight wobble. Turn off oven, crack door, cool 30 minutes in oven.
Transfer to wire rack, cool completely. Refrigerate at least 4 hours or overnight.
Top each with lemon curd before serving. Garnish with fresh berries and mint if desired.