In a small bowl, mix together brown sugar and cinnamon and set aside.
In a large bowl, whisk together eggs, milk, granulated sugar, vanilla, and oil.
Add in flour, baking powder, and salt and stir until just combined. Do not overmix. It is okay if there are some lumps in the batter.
Pour in 1/3 of the batter into a greased and floured or parchment lined 9x4 inch loaf pan.*
Sprinkle in 1/3 of the cinnamon sugar. Repeat with another 1/3 of the batter and cinnamon sugar.
Pour the last of the batter.
Run a knife through the bread to create a marbling effect.
Sprinkle the top with the last of the cinnamon sugar mixture.
Bake in oven for 50-60 minutes or until a toothpick comes out clean.
Let bread cool for 15 minutes in the pan, then turn out onto a wire rack to cool completely.
Once bread has completely cooled, make glaze by combined powdered sugar with 1 ½ teaspoons milk. Stir until combined. If the glaze is too thick to easily drizzle, add in another ½ teaspoon of milk. Adjust milk or powdered sugar until you have reached a syrup-like consistency.
Drizzle glaze over bread, slice, and serve. Enjoy!
*You can use a slightly different size loaf pan if you'd like, but please know that the baking time will be different. Watch the bread closely.The calories shown are based on the bread being cut into 10 pieces, with 1 serving being 1 slice of bread. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**