Cutler's Brownie Marshmallow Cookies (GFCF style)

Cookies
1 cup butter (I used Best Life)
1 2/3 cups white sugar
2 eggs
1 ¼ teaspoon vanilla
¾ cup unsweetened cocoa
¼ teaspoon salt
1 ¼ teaspoon baking powder
2 1/3 cups cake flour (I used Bob's Red Mill Baking Flour - GF + 1 tsp xanthan gum)

Cream butter and sugar. Add eggs and vanilla and mix until blended well. Add dry ingredients and mix. Cookies can be rolled, formed into drop cookies, or pressed into a 9 x 13 pan (double recipe and bake time). Roll and form cookies and bake at 350 for 10-12 minutes. Cookies are done when top is slightly cracked and no longer looks wet.

Marshmallow Creme
3 egg whites
2 cups light corn syrup
½ teaspoon salt
2 ½ cups powdered sugar
1 tablespoon vanilla

Combine egg whites, corn syrup, and salt. Beat on high speed for 10 minutes or until thick. Add powdered sugar and beat on low speed until blended. Add vanilla and blend. May be frozen for later use.

Chocolate Frosting
1 cup butter (I used Best Life)
4-5 cups powdered sugar
milk (I used Soy)
½ cup cocoa
1 teaspoon vanilla

Beat soft butter, cocoa, and powdered sugar together until smooth. Add a splash of milk and vanilla, blend well.

Assembly:Spread cooled cookies with about 1 tablespoon of marshmallow creme. Top the creme with frosting.