In a large bowl, cream butter and sugar until light and fluffy. Add eggs, one at a time, beating well after each addition. Combine the flour, baking powder, cinnamon, salt and nutmeg; add to creamed mixture alternately with milk. Stir in the pecans and oregano.
Pour into a greased 9x5-in. loaf pan. Bake at 350° for 50-60 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack. Serve warm.