Yes, it is absolutely okay to refrigerate baked brownies after they have cooled completely and then eat them the next day. In fact, refrigerating brownies can help keep them fresh for a longer period.
Here's the recommended process:
Cool Completely: Allow the freshly baked brownies to cool completely at room temperature. This helps them set and develop the proper texture.
Cut and Store: Once the brownies have cooled, cut them into squares or the desired serving size. Store the brownies in an airtight container or wrap them tightly with plastic wrap.
Refrigerate: Place the container with the brownies in the refrigerator. The cool temperature of the refrigerator helps maintain the brownies' freshness and prevents them from drying out.
Enjoy the Next Day: The refrigerated brownies can be enjoyed the next day. They should stay delicious and safe to eat for a few days when properly stored in the refrigerator.
Refrigerating brownies is particularly beneficial if the recipe contains perishable ingredients like dairy or if you're in a warm climate where the brownies may spoil faster at room temperature.
If you want to keep brownies for longer than a few days, you can consider freezing them. Wrap individual brownie pieces in plastic wrap and place them in an airtight container or freezer bag before storing them in the freezer. Properly frozen brownies can last for several months and can be thawed and enjoyed whenever you crave a sweet treat.