Preheat to 375°F (190°C). Lightly grease or line a 9-inch springform pan.
Mix graham cracker crumbs and melted butter until evenly moistened. Press into pan.
Bake for 5 minutes until lightly golden. Let cool completely.
Beat cream cheese, sugar, and sour cream until smooth and fluffy (about 3 minutes).
Add eggs one at a time, mixing well after each.
With the last egg, mix in flour, vanilla, and lime juice until smooth.
Gently fold in minced jalapeño. Don’t overmix.
Pour batter into cooled crust and smooth the top.
Bake at 375°F for 15 minutes. Reduce to 250°F and bake 50–55 minutes, until center is just set.
Step 10: Cool & Chill
Run a knife around the edge. Cool 1 hour, then chill at least 4 hours or overnight.