Making Cinnamon Donut Bread can be simple if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour a 9×5-inch loaf pan.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, cinnamon, and salt. Set aside.
3. Cream Butter and Sugar: In a large mixing bowl, cream the softened butter and granulated sugar until light and fluffy.
4. Add Eggs and Vanilla: Beat in the eggs one at a time, mixing well after each addition. Stir in the vanilla extract.
5. Combine Mixtures: Gradually add the dry ingredients to the wet mixture, alternating with the milk. Mix until just combined; be careful not to overmix.
6. Prepare Filling: In a small bowl, mix the brown sugar and ground cinnamon to create the filling for the loaf.
7. Layer the Batter: Pour half of the batter into the prepared loaf pan. Sprinkle half of the cinnamon sugar mixture over the top.
8. Repeat Layers: Add the remaining batter over the cinnamon sugar and then sprinkle the rest of the mixture on top.
9. Swirl: Use a knife to gently swirl through the batter to create a marbled effect without overdoing it.
10. Bake: Place in the preheated oven and bake for 45-50 minutes or until a toothpick inserted into the center comes out clean.
11. Cool: Allow the bread to cool in the pan for 20-30 minutes. Then, carefully remove it from the pan and cool completely on a wire rack.
12. Prepare Glaze: In a separate bowl, whisk the powdered sugar and milk until smooth. Adjust the consistency as needed.
13. Glaze the Bread: Once fully cooled, drizzle the glaze over the top of the bread.

These steps will guide you in creating this exquisite Cinnamon Donut Bread that will surely win hearts.