Preheat oven to 350°. Line a 13x9-inch baking pan with parchment paper. Spray with nonstick baking spray with flour. Set aside.
In a medium bowl, stir together crushed graham crackers, butter, and salt until combined. Firmly press crumb mixture into bottom of prepared pan. Bake until golden brown, approximately 12 minutes. Remove from oven, and let cool completely. Reduce oven temperature to 275°.
In a stand mixer fitted with the paddle attachment, beat cream cheese and sugar until smooth. Add flour, beating to combine. Add eggs, one at a time, beating well after each addition. Add sour cream, milk, and vanilla extract, beating until smooth. Pour batter over cooled crust.
Bake until center is set, approximately 45 minutes. Turn off oven. Let cool in oven for 45 minutes. Remove from oven, and let cool completely.
In a small saucepan, heat cream just to a boil. Remove from heat, and stir in chocolate until melted and smooth. Let cool for 15 minutes. Pour over cheesecake. Refrigerate until cooled and set, at least 4 hours.
To serve, cut into squares, and garnish with Sugared Rose Petals, if desired.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/cheesecake-bars-recipe/