Preheat your oven to 350°F (175°C) and line baking sheets with parchment paper.
In a large bowl, whisk together flour, baking powder, baking soda, and salt.
In a separate bowl, beat the butter with brown sugar and granulated sugar until creamy and fluffy. Add eggs one at a time, mixing well after each. Incorporate vanilla extract.
Gradually add the dry ingredients to the wet mixture, mixing just until combined. Fold in M&M’s carefully.
Scoop dough onto prepared baking sheets, spacing about 2 inches apart. Press extra M&M’s on top if desired.
Bake for 10-12 minutes until edges are lightly golden. Let cool completely on a wire rack.
To assemble, place a cookie flat side up, scoop ice cream onto it, and top with another cookie. Roll sides in mini M&Ms or sprinkles if desired.
Freeze sandwiches for at least one hour to firm up the ice cream.
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Notes
Wrap sandwiches individually in parchment paper or plastic wrap for storage. Keep in the freezer for up to two weeks.