In a large mixing bowl (or using a stand mixer), add 1 cup warm milk and sprinkle with instant yeast. Whisk in 1 egg, 4 Tbsp sugar, 1 Tbsp melted butter and 1/2 tsp salt.

Add 3 cups flour and stir in with a firm spatula or wooden spoon until dough is no longer sticking to fingertips or the walls of the bowl. It should still feel slightly sticky but won’t stick to clean/dry fingertips. Knead dough by hand for 3 minutes. Cover with plastic wrap and let rise in a warm 100˚F oven for 30 minutes (or at room temp 1 hour), until doubled in size.

Generously dust a clean work surface with flour and turn the dough out onto the floured surface. Sprinkle dough lightly with flour and roll into even 17″x10″ rectangle, squaring off the sides. Dot the surface of dough with 6 Tbsp softened butter and spread it out evenly all the way to the edges.

In a small bowl, stir together 1/4 cup sugar and 2 Tbsp cinnamon and sprinkle ALL OF IT evenly over buttered dough. Roll the dough up starting with one of the longer sides and work in a typewriter motion, keeping a tight roll. Once it's rolled up, push ends in slightly to make them a little more uniform then slice into 12 equal-sized rolls.

Butter sides and bottom of a 9×13 baking pan with 1 Tbsp butter and arrange cinnamon rolls, evenly spaced with the cut-side down. Cover with plastic wrap and let rise in a warm 100˚F oven 20-30 minutes, (or room temp 50-60 min), until puffed. Do not proof too long.