Preheat oven to 350 degrees F. Line a bread pan with parchment paper or spray with non-stick cooking spray.
Cream butter and sugar in a mixing bowl. Add in eggs, milk, and vanilla and stir to incorporate. Mix in flour, salt, and baking powder. Fold in apples and nuts. Transfer mixture to prepared baking pan.
For topping, combine all ingredients and mix with a fork or pastry mixer until crumbly. Sprinkle over batter in pan.
Bake for 55-60 minutes, until toothpick inserted in bread, comes out clean. (Internal temperature of bread will be 200 degrees F when fully cooked.)
Let cool. Remove from pan and drizzle top with vanilla glaze. Slice and serve.
Store leftovers in an airtight container.
