The Pioneer Woman: Chocolate Strawberry Nutella Cake (with her basic chocolate cake recipe).
Peanut Butter Chocolate Chip Muffins-lots of peanut butter flavour, easy to make. Would replace all purpose flour with white whole wheat flour and might try to replace brown sugar with honey/molasses or maple syrup.
Nutella Tart- make them mini, cookie-sized
The best chocolate mousse of your life in under 5 minutes and only 2 ingredients Chocolate Chantilly, starts with melting chocolate in water and ends with whisking it until thickened.