Dissolve yeast in warm water in a large mixing bowl.
Add milk, 1/2 cup sugar, 1/2 cup butter, salt, eggs, and 3 cups of flour; beat mixutre until smooth. Beat in additional flour as needed until a soft workable dough is formed.
Place dough onto a floured surface; knead until elastic and smooth not more than 5-7 minutes.
Place the doiugh in a buttered bowl; turning dough to butter all around. Cover and let rise in a warm place until doubled; approx 1.5 hours. Punch down; cover and let rest about 5 minutes.
Turn dough out onto a floured surface; roll into a 16x18 inch rectangle. Spread with 1/4 cup softened butter.
Combine1/2 cup sugar and spices; sprinkle over dough. Sprinkle chocolate pieces over sugar.
Roll up frimly starting at the 16-inch side. Pinch end to seal. Cut into 8 slices. Place in a greased 13x9 inch baking pan (Optinally you can use a thin piece of monofilament line wrapped around the roll;pull the ends tight to make each cut without compressing the roll).
Let rise until doubled, about 40 minutes,. Bake in a 375 deg oven for 25-30 minutes.
Mix together Vanilla Glaze ingredients until smooth.