Making Brownie Ice Cream Sandwiches is simple! Follow these easy steps to create your own:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13 inch baking pan.
2. Mix Wet Ingredients: In a large bowl, combine the melted butter and granulated sugar. Mix until well combined. Beat in the eggs, one at a time, then stir in the vanilla extract.
3. Combine Dry Ingredients: In another bowl, whisk together the flour, cocoa powder, salt, and baking powder.
4. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, stirring until just combined. Do not overmix; a few lumps are okay.
5. Pour Batter: Spread the brownie batter evenly into the prepared baking pan.
6. Bake: Place the pan in the preheated oven and bake for 25-30 minutes, or until a toothpick inserted in the center comes out mostly clean with a few moist crumbs.
7. Cool Brownies: Allow the brownies to cool in the pan on a wire rack for about an hour, or until completely cool.
8. Soften Ice Cream: Meanwhile, let the ice cream sit out for a few minutes to soften slightly for easier spreading.
9. Assemble Sandwiches: Once the brownies are cool, cut them into square or rectangular pieces. Spread a generous scoop of softened ice cream on one brownie piece, then top with another brownie piece to create a sandwich.
10. Optional Decoration: Roll the edges in sprinkles, chocolate chips, or nuts if desired for extra decoration.
11. Freeze: Place the assembled sandwiches on a plate or tray in the freezer for at least 30 minutes to firm up.