Preheat oven to 350F
Cut parchment paper to fit the bottom of a 9-inch spring-form pan and spray the sides with a non-stick spray such as Baker's Joy with flour.
Mix dry ingredients in a bowl
In a separate bowl, cream the butter and brown sugar until fluffy
Add eggs to butter/sugar mixture one at a time and mix until blended
Add vanilla and almond extract, continuing to mix until blended. Don't over-do the almond extract! It can be overwhelming, but a small amount adds a nice undertone.
Add half the dry ingredients to the butter/sugar/egg mixture and blend until combined, then add the second half and continue until well-mixed
Finally, add the Reese's pieces (or nuts, if using...) and blend on low speed
Place the batter in the prepared baking pan and cook for twenty minutes. A toothpick should come out clean when the brownies are done.
Cool for about ten minutes before removing from the pan