Grease 1 lb loaf pan and preheat oven to 300°F.
In a large mixing bowl, beat butter until light in color (about 3 minutes). Gradually incorporate sugar and cinnamon until light and fluffy.
On low, add eggs one at a time until just incorporated.
Gradually add flour and milk alternating until smooth. Add vanilla extract. Fold in apples.
Pour batter into loaf pan and fill ¾ high to compensate for rise. Bake 65 minutes or until a toothpick inserted into the center of the cake comes out clean.
Optional: Top with glaze.
In a large mixing bowl, combine butter, powdered sugar, vanilla and heavy cream on medium until smooth.
Warm in microwave 30 seconds to make it a pourable. Pour over top of pound cake and allow to set before slicing.