Warm your milk in the microwave for about 20-30 seconds, it should be warm when you touch with your finger but not hot. Too hot and you might kill the yeast!

Pour your warmed milk into a mixing bowl fitted with a paddle attachment and sprinkle your yeast over the top. Give it a light stir and allow it to sit for 5 minutes to activate your yeast, it should get a little frothy

Add in your sugar, sweet potato, melted butter, vanilla, salt, and cinnamon, mixing until combined

Remove the paddle attachment from your mixer and replace it with a dough hook before adding in your flour. Beat on a low speed until your flour is combined before moving to a medium speed for 5-10 minutes until your dough is smooth and elastic. To check if your dough is ready, pull off a piece of dough and pull it into a square, holding it up to the light. If you can see light come through the dough without the dough tearing, congrats your dough is ready for its first rise

Note: you can do this without a mixer, whisking together your wet ingredients before using a spatula to add in your flour. Then knead on a lightly floured surface. This will take a bit more time… and your arms might hurt, but you can do it

Lightly grease a large bowl and place your dough inside. Cover with a clean towl and place in a warm spot to rise for 60-90 minutes, or until doubled in size

While your dough is rising, make your cinnamon-sugar filling. Simply mix together your brown sugar and cinnamon in a bowl, set aside, and place your softened butter in another small bowl - you want it spreadable but not melted

Grease and line a 9”x5” loaf pan with parchment paper

When your dough is ready to shape, punch it down to release the air, turn it onto a lightly floured surface, and roll it to a 12”x16” rectangle

Spread your softened butter evenly over the dough before sprinkling over your cinnamon sugar. Use your fingers to gently rub your cinnamon sugar into the butter, to help it stick and form a sort of paste

Using a pizza cutter or sharp knife, slice your dough vertically into three equal strips and then horizontally into 5 equal strips. You should have 15 squares of dough

Dough side down (cinnamon-sugar side up) stack your dough so the bottoms match up, then carefully place (bottom edge down) in your loaf pan. They should fit fairly snuggly, with a little room to grow

Cover with your clean towel and let the dough rise in a warm sport for another 30-45 minutes, until it has puffed and filled the pan

Preheat your oven to 350F

In a bowl whisk together your egg and a splash of water or milk, to make an egg wash. Brush over the top of your dough, to get that beautiful golden brown bake

Bake for 30-45 minutes on the middle rack, removing from the oven halfway and covering with foil, this will prevent the top of your loaf from burning. Insert a digital thermometer into the middle of your dough, once it reads 180F remove it from the oven

Allow the bread to cool in the pan for 10 minutes before removing and placing on a wire rack to cool slightly

To make your glaze, place your butter into a small saucepan over medium-low heat. Once it melts, swirl your pan every 30 seconds, until the fats start to drop to the bottom of the pan and brown. When the bits a nicely brown - think caramel - immediately remove your butter from the heat and pour it into a bowl. Sift in your powdered sugar and whisk until smooth before whisking in your milk and vanilla

Drizzle your glaze over the top of your warm bread and enjoy!