Sift together the flour, leveled baking powder, leveled baking soda, salt, cinnamon, nutmeg, sugar, and oatmeal in your mixing bowl.
In another mixing bowl, stir in the eggs, oil, molasses, milk, orange juice, rind, and grated carrot before slowly combining the dry ingredients until well mixed.
Pour into a greased sheet cake pan 13" x 9" x 2".
Bake in a 350-degree oven for about 35 minutes, depending on how your oven is regulated. Test with a cake tester, toothpick or slender knife to see if anything sticks.
Allow to cool before frosting.
Creamy Frosting: 3 cups of confectioners’ sugar 1/4 cup of butter 1 teaspoon of orange extract, orange juice or lemon juice 1 teaspoon of vanilla 1/4 cup of milk
You will need an electric mixer for this part to throughly cream all the ingredients together until creamy and a fluffy consistency.