Sour Cream Cinnamon Rolls

Rolls
1 Heat the sour cream to lukewarm.
2 Stir in 2 tablespoons butter, sugar, baking soda, and salt.
3 Stir yeast into warm water.
4 Add yeast and beaten egg to sour cream mixture.
5 Mix in enough flour to create a soft dough.
6 Turn out on a floured counter and knead lightly for a minute.
7 Form into a ball and let rest for 5 minutes.
8 Sprinkle the counter with flour and roll into a 13x9-inch rectangle.
9 Spread the dough with softened butter.
10 Mix the brown sugar and cinnamon and sprinkle over the butter, pressing in lightly.
11 Roll up like a jelly roll and cut in 12 pieces.
12 Place in a 13x9-inch baking pan that's been greased with butter or sprayed with non-stick cooking spray.
13 Let rise until doubled - about 1-½ hours.
14 Preheat the oven to 375°F.
15 Bake for 20 to 25 minutes or until golden brown.
16 Remove from oven.
17 Cover with icing while still warm.
Icing
19 Melt the butter.
20 Add the vanilla.
21 Stir in the powdered sugar until you have a thick icing.
22 Spoon onto the warm rolls.