Preheat oven to 350°F. Grease a 9x13-inch baking pan.
For the crust, mix together the flour, butter and brown sugar until crumbly. Press into the baking pan and bake for 12-15 minutes or until lightly brown.
For the filling, beat the eggs, corn syrup, sugar, butter and vanilla extract with a wire whisk. Stir in the chunks and pecans. Pour evenly over the baked crust and bake for 25-30 minutes or until set.
Cool in the pan on a wire rack. Cool completely and cut into bars. Store in an airtight container at room temperature (or in the refrigerator if you live in a warm/humid area with no air conditioning).