Preheat oven to 350 degrees (F).
Combine flour, sugar, salt, and baking powder in a large mixing bowl. Cut in butter until mixture is crumbly.
Combine egg, sour cream, and eggnog in a separate dish, then add to dry mixture. Combine until mixture holds together. If needed, a splash more of eggnog can be added.
Pat dough into a large circle, about 1/2-inch thick. Now cut dough into 10 to 12 triangles and place on a well-greased (or parchment-lined) baking sheet.
Bake scones for approximately 25 minutes or until golden brown.
For a sweet topping, combine 1/2 cup powdered sugar with 2 tablespoons eggnog and drizzle over scones.
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