Mix together 1 C brown sugar, flour, 3 T cocoa, baking powder and salt. Stir in milk, butter and vanilla. Spread over the bottom of slow cooker. Mix together 3/4 C brown sugar and 1/4 C cocoa. Sprinkle over mixture in slow cooker. Pour in boiling water. Do not stir. Cover and cook on high 2-3 hours until toothpick comes out clean.
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