Dissolve yeast in 1/2 cup warm water sprinkled with 1 Tbsp. sugar. In a large bowl mix 2 1/2 cups warm water, butter pieces, sugar, eggs, and salt. Gradually add flour until it pulls from the sides. Cover with a towel and let rise 1 hour. Divide dough into 2 pieces. Roll each into a rectangle. Brush with softened butter. Sprinkle with brown sugar and cinnamon. Roll from long edge and seal. Cut into wheels with thread and place in a 9 x 13 pan. Bake at 350 degrees for 15-20 min. Frost with favorite frosting.