In a large mixing bowl, whisk together the flour and yeast. Keep aside.
In a microwave-safe bowl, add sugar, butter, milk, water. Heat in the microwave for about 1 minute or until better is melted.
Pour this milk mixture to the flour mixture and also add the egg.
Mix in a stand mixer with the paddle attachment until the dough becomes sticky.
Remove the paddle attachment and replace it with the hook attachment. Continue mixing until the dough becomes elastic.
Note: If you are not using a stand mixer, you can also knead this dough by hands on a floured surface until dough becomes elastic. It will take about 6-8 minutes by hands.
Cover the dough with plastic wrap and let it rest for 6 minutes or until the plastic becomes foggy.
While the dough is resting, heat the oven to 200 degrees and then, turn it OFF.
Prepare the filling by mixing together brown sugar, cinnamon powder and vanilla extract in a mixing bowl. Keep aside.
Next, roll out the dough on a floured surface (Dimensions: 9x16).
Brush softened butter on top of the dough.
Spread the filling on top evenly.
Roll the dough from one end to the other, jelly-roll style.
Use dental floss to make 12 even slices. There may be some additional odd-shaped slices from the ends.
Place these rolls in a greased rectangle cake pan (Dimensions: 9x13). Make sure to leave space between the rolls to allow them enough space to rise.
Cover tightly with aluminum foil.
Place in the warm oven and let the rolls rise for 25 minutes. Make sure the oven is turned OFF!
Remove the pan from the oven and place on counter.
Heat oven to 375 degrees.
Remove aluminum foil from pan and bake for 15-18 minutes or until rolls are golden brown.
While the rolls are baking, prepare the glaze by mixing together butter, powdered sugar, vanilla extract and milk until smooth and creamy. Note: Use clear vanilla extract if you want a super white glaze/frosting. The regular vanilla extract has a brown color which makes it a little off-white.
Spread the glaze on top after the rolls have cooled down for about 10 minutes. Some of it will get absorbed and make very ooey gooey rolls and some of it will settle on the top for a pretty appearance. Enjoy!
Note: If you prefer your sweet rolls super sweet, double the glaze recipe and spread as much as you like.