In a large bowl, combine flour, baking powder, and salt
In a medium bowl, beat one egg. Add milk, honey, oil, and vanilla and mix together.
Add wet ingredients to dry ingredients and mix until combined.
Pour half your batter into a greased loaf pan.
In a small bowl, mix together sugar and cinnamon.
Sprinkle about half your cinnamon sugar mixture over you batter.
Using a toothpick, swirl the mixture into the batter.
Pour in the rest of the batter and repeat the process.
Bake at 350 degrees for 45-50 minutes, or until a knife comes out clean.
Cool and slice