For the Oreo cookie base:

1. Preheat oven to 350 degrees F.
2. Prepare an 8 inch by 8 inch baking pan, see note, and spray the inside with cooking spray.
3. Combine the Oreo cookie crumbs and the melted butter. Press into the bottom of baking pan.
4. Bake in 350 degree F oven for 5 minutes.
5. Remove from oven and let cool slightly while preparing brownie batter.

For the brownie:

1. In a medium mixing bowl, whisk eggs and sugar until blended.
2. Add cooled melted butter and melted chocolate and whisk to combine.
3. Combine dry ingredients in bowl and sift over chocolate mixture. Stir with a wooden spoon or rubber spatula just until combined. Do not over mix.
4. Add semisweet chocolate chunks and stir gently to combine.
5. Pour into baking pan and smooth the top.
6. Bake in 350 degree F oven until set, about 40 minutes. Be careful not to overbake or the brownies will not be fudgy. They should be slightly underdone.
7. Remove from oven and let cool 5 minutes before adding glaze.

For the chocolate fudge glaze:

1. Combine glaze ingredients in a mixing bowl and stir only to combine. Do not over mix. The glaze should be smooth but not whipped and airy.
2. Spread glaze on brownies 5 minutes after removing from oven.
3. Let brownies cool several hours to room temperature. Refrigerate until chilled.
4. Remove brownies from refrigerator and remove from pan.
5. Cut into squares.
6. Store brownies in a covered container in the refrigerator or a cool room temperature.