Preheat the oven to 350 degrees F.
In a medium mixing bowl, using a stand or hand mixer, mix all ingredients together for the crust until fully incorporated.
When dough is completely mixed, press into the bottom of a 9 x13 casserole dish by hand. Be sure to press the mixture firmly into the dish, covering the entire bottom evenly.
Bake for 20-25 minutes. When done, set the crust aside and do not turn off the oven.
In another medium mixing bowl, with a large wooden spoon, combine brown sugar, granulated sugar, salt and cornstarch. Toss until ingredients are fully incorporated. In a small bowl, whisk together eggs, cream and syrup. Combine sugar and egg mixture until fully incorporated.
Pour mixture into a large saucepan over medium heat. Bring to a simmer while stirring constantly. Remove from heat and add in butter; stir until melted. (Tip...slice butter into tablespoon pieces so it melts faster.) Stir in vanilla and pecans. Make sure pecans are completely coated and incorporated into the mixture.
Pour pecan mixture over the top of the crust. Spread evenly and bake for 35 minutes.
Cool until bars reach room temperature then chill in the refrigerator for 6+ hours before slicing.
When cooled, slice into twelve or sixteen bars. Remove from pan using a spatula and serve immediately.