Making Brownie Ice Cream Sandwiches is a simple and enjoyable process. Just follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and line a 9×13-inch baking pan with parchment paper for easy removal.
2. Melt Butter: In a medium saucepan over low heat, melt the unsalted butter. Remove from heat and let it cool slightly.
3. Mix Ingredients: In a large bowl, combine the melted butter and granulated sugar. Stir well until fully incorporated.
4. Add Eggs and Vanilla: Add the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
5. Incorporate Cocoa and Dry Ingredients: Sift together the cocoa powder, flour, salt, and baking powder. Gradually add these dry ingredients to the wet mixture, stirring until just combined.
6. Pour Batter: Pour the brownie batter into the prepared baking pan and smooth out the top with a spatula.
7. Bake: Place in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.
8. Cool: Allow the brownies to cool in the pan for about 30 minutes before transferring them to a wire rack to cool completely.
9. Slice Brownies: Once the brownies are cool, remove them from the pan and slice them into squares, roughly the same size as the ice cream scoop you’ll use.
10. Assemble Sandwiches: Take one brownie square and place a scoop of ice cream on top. Use another brownie square to create a sandwich. Press down gently.
11. Garnish (Optional): Roll the edges of the ice cream in chocolate chips, sprinkles, or nuts for an extra pop!
12. Freeze: Place the assembled sandwiches on a baking sheet and freeze for at least 30 minutes to help them firm up.