Preheat oven to 350. Lightly grease an 8x12-inch baking pan or cake pan with cooking oil spray, add a little flour. Optional: Line with parchment paper (or baking paper); set aside. Combine melted butter, oil and sugars together in a medium-sized bowl. Whisk well to combine. Add the eggs and vanilla; beat until lighter in color (another minute). Sift in flour & cocoa powder. Gently fold the dry ingredients into the wet, do not over beat.

Fold in half of the chocolate pieces. Pour batter into the pan & lightly spread evenly. Top with remaining Heath bar pieces. Cook 30 min. If want more crispy brownies cook 35. Let cool before cutting.