Read it & see why..this is completely over the top. Girls night? Perfect. Because there are so many layers, ingredients may be listed twice for each section. Please add together accordingly for total amounts. For a fast & easy version, read below in the first comment.
In large bowl, beat together 1/2 cup butter, sugar, & 3/4 teaspoons vanilla until creamy. Add eggs one at a time. Stir dry ingredients into batter. Pour batter into prepared pan - spread evenly. Sprinkle chocolate chips on top. Bake for 22-25 minutes.
When brownies are done baking; combine peanut butter & oil in a microwave safe bowl or measuring cup and microwave on high for 20 seconds to soften. Pour over hot brownies & spread. Now sprinkle this layer with marshmallows. Return to oven to bake for 3 more minutes, or until the marshmallows are puffy. Remove from oven & sprinkle on toasted pecans.
For frosting; combine confectioners sugar & salt in bowl. In small saucepan, melt 4 Tbls butter over medium heat. When butter is melted, add the 2 Tbls of cocoa powder & 1/4 cup of the milk then heat until the mixture begins to boil. Pour this mixture into confectioners sugar/salt mixture & beat on high speed with an electric mixer until smooth and glossy. If frosting is not pourable at this point, add remaining 2 Tbls of milk if needed. Last, beat in 1/4 tsp vanilla, pour evenly over marshmallows & pecans.
Let cool completely in refrigerator for 1-2 hours. Cut into squares and try to share!
need to additionally add in 1 tsp Guar gum or xanthan gum for every cup of flour used if using gluten free flour or it won't congeal