01 - Preheat oven to 350°F. Line a 9x9 inch baking pan with parchment paper, leaving overhang for easy removal.
02 - In a medium bowl, combine graham cracker crumbs, melted butter, sugar, and salt until evenly moistened. Press firmly into bottom of prepared pan. Bake for 10 minutes, then let cool slightly.
03 - Beat cream cheese until smooth. Add sour cream and sugar, mixing until creamy. Beat in eggs one at a time, then add vanilla and flour. Mix until just combined, avoiding overmixing.
04 - Pour filling over crust and smooth top. Bake for 35-40 minutes until center is set but still slightly jiggly. Cool completely on wire rack, then refrigerate at least 2 hours.
05 - Heat sugar and water in saucepan over medium heat, swirling pan until mixture turns deep amber. Remove from heat and carefully whisk in butter. Slowly add heavy cream while whisking until smooth. Stir in sea salt.
06 - Cool caramel slightly, then pour evenly over chilled cheesecake. Refrigerate for 1 hour until set.
07 - Lift bars from pan using parchment overhang. Cut into 16 squares and serve chilled.