Preheat oven to 325 degrees and butter an 8-inch square pan. Line bottom/2 sides with parchment and butter parchment,

Melt butter and chocolate together. Remove from heat and stir in all remaining ingredients.

Pour into prepared pan. Bake 30-35 minutes, until a cake tester in the center comes out with moist crumbs. Let cool 15 minutes, then lift out (using parchment) and cool completely on rack.
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