Grease and flour your loaf pan or line it with parchment paper.
In one bowl, whisk together the flour, sugar, baking powder, and salt.
In another bowl, combine the milk, eggs, vegetable oil, and vanilla extract.
Gradually mix the wet ingredients into the dry ingredients. Don’t overmix; a few lumps are fine for a tender crumb.
Create the Cinnamon Swirl:
In a small bowl, stir together the brown sugar, cinnamon, and melted butter until combined.
Layer the Bread:
Pour half of the batter into the prepared loaf pan.
Spoon half of the cinnamon swirl mixture over the batter.
Pour the remaining batter on top, followed by the rest of the cinnamon swirl.
Use a knife to gently swirl the cinnamon mixture into the batter, creating beautiful ribbons of flavor.
Bake:
Place in the oven and bake for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Let it cool in the pan for 10 minutes before transferring to a wire rack.
Add the Donut-Style Topping:
While the bread is still warm, brush the top with melted butter.
Mix the granulated sugar and cinnamon together, then generously sprinkle over the top of the loaf for that irresistible donut-style finish.
Notes
Make It Gluten-Free: Swap the flour with a 1:1 gluten-free baking flour.
Dairy-Free Option: Substitute whole milk with almond, oat, or coconut milk.
Lower Sugar Alternative: Reduce the granulated sugar by 25% or use a sugar substitute.
Nutty Twist: Fold 1/2 cup of chopped walnuts or pecans into the batter.
Pumpkin Spice Variation: Replace 1/4 cup of milk with pumpkin puree and add a pinch of nutmeg.
Storage Tip: Store leftovers in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate for up to a week or freeze for up to 2 months.