Fudgy Marshmallow Bars

* 1 stick butter
* 1 c. chocolate graham cracker or chocolate wafer crumbs (12 cookies)
* 2 Tbs. packed light brown sugar
* 1/4 tsp. plus a pinch of salt
* 2 oz. unsweetened chocolate, chopped
* 3/4 c. sugar
* 1 tsp. vanilla
* 2 large eggs
* 1/2 c. flour
* 2 c. mini marshmallows
* 1/2 c. semisweet chocolate chips

Preheat oven to 350. Butter an 8" sq. pan & line with parchment paper. Melt 1/2 of butter & then mix with crumbs, brown sugar & a pinch of salt. Press firmly into bottom of pan. Bake in bottom third of oven until set, 10-12 min. Combine remaining butter & unsweetened chocolate in a heatproof bowl; microwave at 20-second intervals until melted, stirring after each interval. Cool slightly. In a separate bowl, whisk sugar, vanilla & eggs. Stir in chocolate mixture. Add flour & mix until just combined. Pour over cooled crust & bake until just set, 22 minutes. Remove from oven. Set broiler on high & place oven rack 3" from heat. Sprinkle marshmallows & chocolate chips over cookie & broil until marshmallows start to brown, 1 minute. Remove from oven & let cool before cutting into squares.