Slow Cooker Hot Fudge Cake

This cake is DIVINE!!!  And even more amazing is that you make it in the crock pot!  I mean, it doesn't get better than this. :)  An awesome fudge sauce forms on the bottom, while the delicious chocolate cake bakes on top.  Of course, it has to be served warm with iceacream on top.  Enjoy!
-1 cup brown sugar
-1 cup flour
-3 Tbs cocoa powder
-2 tsp baking powder
-1/2 tsp salt
-1/2 cup milk
-2 Tbs melted butter
-1/2 tsp vanilla extract
-3/4 cup brown sugar
-1/4 cup cocoa powder
-1 3/4 cup water, boiling
Start boiling the water first.
In a large bowl, mix 1 cup brown sugar, flour, 3 Tbs cocoa, baking powder and salt.  Stir in milk, butter and vanilla.  Spread this mixture on bottom of the slow cooker.
In a small bowl, mix 3/4 cup brown sugar and 1/4 cup cocoa.  Sprinkle over mixture in slow cooker.
Pour in boiling water.  Do NOT stir!
Cover and cook on high for about 2 hours, or until toothpick comes out clean.  Serve warm with ice cream.  Enjoy!
Recipe adapted from here