Preheat the oven to 400 degrees F. Spray two 3/4- by 1 1/8-inch muffin trays with nonstick spray.
In a small bowl, add raisins and cover with warm water to slightly rehydrate. Set aside
In a large bowl, whisk together the dry ingredients (flour, baking powder, salt and sugar). In a medium bowl, whisk together wet ingredients (egg, canola oil, sour cream, heavy cream, vanilla extract, orange zest and lemon zest).
Mix together the wet and dry ingredients until evenly combined. Batter is almost too tender, so feel free to beat well. Drain water from raisins. Fold raisins and cranberries into the batter.
Spoon batter into muffin tins, almost to the top. Bake until risen and lightly browned, about 20 minutes.
Allow to cool in the muffin pans for 5 to 10 minutes. Using both hands on each muffin, loosen the tops of the muffins, then pop them out of the pans. Place on a cooling rack to finish cooling.