1. 1. Preheat the oven to 350°F (175°C) and grease a baking dish.

2. 2. In a mixing bowl, combine 1 cup of all-purpose flour, 1/2 cup of cake flour, 1/4 cup of cocoa powder, and 1/4 cup of bittersweet chocolate (chopped). Mix well.

3. 3. In a separate bowl, melt 1/2 cup of Crisco shortening and stir in 1 can of evaporated milk until well combined.

4. 4. Gradually add the wet ingredients to the dry ingredients and mix until smooth.

5. 5. Pour half of the batter into the prepared baking dish and top with a layer of miniature marshmallows. Add the remaining batter on top of the marshmallows.

6. 6. Bake in the preheated oven for 25-30 minutes or until a toothpick inserted in the center comes out clean.

7. 7. Allow the brownies to cool before cutting into squares and serving.