In a medium size bowl, dissolve the yeast in the water.
Stir in the milk, egg and sugar. Add the 2 cups flour until the batter gets thick.
Beat well with a wooden spoon until smooth, about 100 strokes or use a stand mixer with a dough hook for 2-3 minutes on medium speed.
Fold in the oil and salt. Next add remaining 1 1/4 cups flour and mix until the dough starts to come together.
Add the cinnamon to the dough and mix in.
Transfer the dough to a floured work surface and Knead the dough for about 5 minutes ending with a ball shape.
Transfer to a bowl which has been greased with a tablespoon of olive oil.
Cover and let rise for another 30 minutes.
Prepare a 9 x 5 inch loaf pan by rubbing the inside with butter, set aside.
After 30 minutes, punch the dough down and cut it roughly into 8 even pieces.
Toss each piece into the brown sugar then roll them into balls.
Place the balls into the prepared baking pan making sure they are close together.
Sprinkle any leftover brown sugar over the dough balls
Using your fingers, crumble the chilled butter and the 1/4 cup flour together until you end up with small nuggets of buttery flour.
Sprinkle the buttery chunks over the top of the dough. Cover and let rise again for 30 minutes. Preheat the oven to 350 degrees.
Place in the oven and bake for about 30 minutes or until the top is a rich golden brown. Let rest for 10 minutes.
Whisk the powdered sugar and milk together until smooth. Drizzle all over the warm bread.
Slice and serve warm.