I have made these brownies for years and have never had a problem. I let them cool; wrap them individually in plastic wrap; keep them in the freezer in a freezer bag. We just grab one when we need one. You have to remember that they are not exactly like a boxed brownie. Here is he recipe I always use:
Chocolate Bean Brownies, all phases [recipelover's version]My bean muffin/brownie recipe summarized link:
viewtopic.php?f=5&t=988751 14 1/2 - 15 oz. can black beans, drained and rinsed (can also use cannelini or great northern instead)
4 large eggs (I now 4 egg whites and 1 whole egg for less cholesterol]
3 T. oil [you can use just 2 T. if you wish but I use 3 T.]
scant 3/4 c. bulk Splenda
3 T. cocoa powder
1/2 tsp. of expresso powder (can omit)
1/4 c. flaxmeal (ground flaxseed) or ground almond meal (my optional new addition)
1 tsp. baking powder
1 tsp. vanilla
(1 tsp. Watkins caramel extract makes a great addition or 1/2 tsp. almond extract)
Stir in or sprinkle over in the pan:
chopped walnuts
dark choc chips (probably should wait until Phase 2)[or sugar-free chocolate chips]
Because black beans are a little more dense and my blender cannot easily blend them well, this is how I add the ingredients to make it easier: 2 eggs, the beans, Splenda, oil, cocoa, espesso pdr, baking pdr, vanilla/almond extracts, then the other 2 eggs. Blend until pureed (may need to stir it every now and then--I use a rubber spatula to help it along a little. I stir the mix while it is blending, but am careful not to get my spatula near the bottom).
Pour into a sprayed 8 x 8 cake pan. Bake at 350 for about 30 min.