In a large bowl, Combine Bisquick, buttermilk, and sugar in a bowl using a fork. Mix just until all combined to create a dough.
In a medium bowl, Combine brown sugar, granulated sugar, cinnamon and raisins in a separate bowl. Add 2 tablespoons melted butter and stir to moisten. Set aside.
Generously flour rolling surface. It may seem like a lot but this is a sticky dough. Turn dough out onto the surface and start patting into a rectangular shape with your hand. Flour your hand well before doing so.
Use a rolling pin to thin dough to about a 1/2-inch thickness. Do not over-roll, the dough will stick.
Once rolled out, pour 3/4 cup melted butter over entire surface then spread with a pastry brush to even out and get to the edges.
Sprinkle sugar mixture over butter.
Start rolling dough from the long end.
Slice into 1-inch to 1/2-inch slices.
Transfer slices to a well-greased (sprayed) 9 x 13-inch pan.
Bake for 25-30 minutes, until just golden brown on tops.
Let sit for 5 minutes before serving.
Combine powdered sugar, milk, and vanilla until desired consistency and drizzle over the rolls.
