Preheat oven to 350 degrees and line a 9x13 pan with parchment paper or foil. Spray generously with non stick cooking spray.
In the bowl of a stand mixer, beat butter and brown sugar on medium until well combined. Add eggs, followed by syrup and vanilla extract and continue beating until smooth.
Turn mixer to low and add flour, salt, baking soda and cinnamon. Stir in apples and pecans. Bake for 30 minutes, or until light golden brown.
While blondies are cooking, prepare glaze. Heat butter, syrup and brown sugar over medium heat. Let simmer 2-3 minutes until slightly thickened. Pour glaze over warm blondies. Let cool and slice.