Melt chocolate. In the microwave heat ¾ cup of heavy cream until it boils Pour the hot cream over the chocolate chips. Let the mixture sit for 1 minute then stir until the chocolate chips are all melted and the mixture is smooth.
Pour chocolate in skillet. Pour the melted chocolate into an 8-inch cast iron skillet, or an 8×8 inch casserole dish. Then pour the peanut butter over the chocolate. Use a spoon to swirl them together.