Preheat oven to 325ºF.
In a large bowl, cream together the butter and brown sugar.
Add the egg and mix again for a few minutes.
Add in the oil and vanilla and mix until incorporated.
Next, sift in the dry ingredients: all purpose flour, baking soda, baking powder, cinnamon, nutmeg and salt.
Line cupcake tin with cupcake liners (about 7-9).
Bake at 350ºF for 12-15 minutes. Cupcakes are done when toothpick inserted comes out clean.
Cool cupcakes in cupcake tin for about 10 minutes, then transfer to wire rack to cool completely.