In a large bowl combine butter, flour, and salt until the mixture resembles a grainy texture. Don’t over beat! Stir in sour cream and vanilla.
Lightly flour surface. Knead dough 6 to 8 times on floured surface until dough holds together.
Divide kneaded dough into 4 equal sized balls and flatten slightly. Wrap each separately in plastic wrap and refrigerate for 4 hours or overnight.
When ready to make cookies, remove dough from refrigerator. Unwrap one of the balls and sprinkle with 2 tablespoons sugar, coating all sides. On top of a piece of wax paper, roll ball into a 5-inch by 12-inch rectangle, coating surface with sugar when necessary.*
Sprinkle rolled out dough with 3/4 teaspoon cinnamon. Lightly mark dough down the center to create two 6-inch by 5-inch rectangles.
Starting with the 5-inch end, roll dough to the center mark. Repeat with other short side. Wrap in plastic wrap and freeze for 30 minutes. Repeat with remaining 3 balls of dough.
While dough is in the freezer, preheat oven to 375° F. Line a cookie sheet with parchment paper.
Remove dough from freezer, cut into 1/2-inch slices and dip each side in sugar. Place 2 inches apart on cookie sheet.
Bake for 10 minutes or until golden brown. Flip the cookies over and bake 5 minutes longer. Remove to wire racks to cool.
Notes
* I taped down the wax paper to my counter to keep it from slipping. Original recipe instructed the dough to be rolled between two pieces of wax paper, but it seemed to be more difficult to remove the dough from the paper. Sprinkling the surface and dough with sugar will help the dough from sticking.