Baking the Cinnamon Swirl Donut Loaf is a joyous activity. Just follow these easy steps:

1. Preheat Your Oven: Begin by preheating your oven to 350°F (175°C). Grease a 9×5-inch loaf pan.
2. Mix Dry Ingredients: In a large bowl, combine the all-purpose flour, granulated sugar, baking powder, salt, and 1 teaspoon of ground cinnamon.
3. Combine Wet Ingredients: In another bowl, whisk together the melted butter, eggs, whole milk, and vanilla extract until perfectly blended.
4. Mix Together: Gradually add the wet mixture to the dry ingredients, stirring until just combined. Be careful not to overmix; some lumps are okay.
5. Prepare the Swirl: In a small bowl, mix the brown sugar and 1 tablespoon of ground cinnamon together until combined.
6. Layer the Batter: Pour half of the batter into the prepared loaf pan, smoothing it out evenly. Sprinkle half of the cinnamon-sugar mixture over the top.
7. Add Remaining Batter: Pour the remaining batter over the cinnamon-sugar layer and gently smooth it out.
8. Finish the Swirl: Sprinkle the remaining cinnamon-sugar mixture on top of the batter. Using a knife, gently swirl the mixture into the batter to create a beautiful marbled effect.
9. Bake: Place the loaf in the preheated oven and bake for 50-55 minutes, or until a toothpick inserted in the center comes out clean.
10. Cool: Remove the loaf from the oven and let it cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.

Following these steps will lead to a fabulous Cinnamon Swirl Donut Loaf that’s sure to win hearts.