Blend bread mix and yeast together in a large bowl. Stir in yogurt or sour cream, and water to form soft dough. Cover and let rise at room temperature until doubled in bulk, about 2 hours.
Preheat oven to 350°F. Line two baking sheets with parchment paper.
Sprinkle countertop with flour and turn dough out. Flour rolling pin and roll dough to 12-inch circle. With a pizza wheel or sharp knife, cut dough into quarters then each quarter into thirds. Starting with the wide end, roll up each triangle and place on baking sheet with point side down. Cover and let rise in a warm place for 1 hour.
Bake rolls for 20-25 minutes until risen and brown.
NOTE: Bread machine may be used instead of making dough by hand. Place ingredients in bread machine pan in the following order: water, yogurt or sour cream, bread mix and yeast.