Preheat oven to 325 degrees F.
For thicker brownies, use an 8x8" baking pan and for thinner, use a 9x9" baking pan. Line the bottom of the pan you are using with parchment paper or aluminum foil, letting some come up the sides to make it easier to remove the brownies from the pan.
Spray the foil/paper with cooking spray and set aside.
In a medium sized pot, melt butter.
Once melted, remove from heat and immediately stir in sugar, cocoa powder, salt, and vanilla extract.
Beat in the eggs, one at a time, stirring vigorously after adding each one.
Add the flour and stir until full incorporated, and then beat with spatula/wooden spoon for 30-40 strokes.
Fold in the chopped candy.
Pour into prepared pan and spread out evenly.
Bake 25-30 minutes, until toothpick comes out clean from the center. For an 8x8" pan, cooking time may be slightly more, up to 35 minutes.
Cut and enjoy!