Heat oven 325F. Spray a 9-inch square pan with non-stick cooking spray. Line pan with parchment paper leaving a 1-inch overhang over sides. Spray parchment with non-stick cooking spray.
In small bowl, beat cream cheese and sugar until creamy. Add 1 egg and ½ teaspoon vanilla; blend well and set aside.
In another bowl, whisk flour, baking powder and salt; set aside.
In large bowl, whisk melted butter and brown sugar until blended. Add remaining eggs and vanilla; blend well. Add flour mixture and mix with a spatula just until dry ingredients are moistened. Stir in ¾ cups pecans.
Spread half the blondie batter over bottom of prepared pan. Drop half the cream cheese mixture by spoonfuls on top.
Reserve 2 tablespoons of caramel. Drop the remaining caramel by teaspoonfuls in between the spoonfuls of cream cheese mixture.
Repeat layering with remaining blondie batter and cream cheese mixture.
Using the tip of a butter knife gently swirl the blondie batter, cream cheese mixture and caramel together creating a marbled effect.
Bake for 50 to 55 minutes or until wooden pick inserted in center comes out clean. Cool in pan on wire rack for 10 minutes.
Using the parchment edges, lift the blondies from the pan to a cooling rack.
Drizzle with remaining caramel and sprinkle with pecans and fleur de sel.
Chill in refrigerator until completely cool. Cut into bars or squares.