Peppermint cloud brownies

I make this at every cookie exchange I have..its great!! And, I love saying that I made brownies from scratch! Its just about as easy as opening the box!

1 stick butter, plus more for pan
2 oz semi sweet chocolate
1/2 c unsweetened cocoa
3/4 c packed brown sugar
2 lg eggs
1/2 c flour
1/4 t salt
2/3 c chopped pecans
1/3 c milk
1 t vanilla
1 1/3 c mini marshmallows
3 T crushed peppermint sticks

Heat oven to 350*. Butter an 8 in square pan and line with a strip of parchment overhanging on two sides. Butter parchment; set aside. In saucepan melt butter, chocolate and cocoa on low heat, stirring until smooth. Remove from heat and stir in sugar, flour, salt nuts, milk and vanilla until combined. Spread batter into prepared pan. Bake until set, about 20 min. Remove from oven and top with marshmallows and bake until marshmallows are puffed, another 5 min. Immediatly sprinkle with peppermint. Loosed edges and lift brownies from pan using parchment. Cut into squares and store in an airtight container up to 1 day.