Gather all your ingredients. Combine dry ingredients together in a large bowl. Note: If you have a sifter, use it to combine all the dry ingredients for an extra luscious scone.
Cut in softened butter. Gently fold in the sour cream and vanilla.
Unroll the dough into a rectangular shape. Spread diced strawberries all over the the dough. Roll the dough into a log.
Place scones onto a lined baking sheet. Brush tops with whisked egg and sprinkle with sugar.
Bake at 350°F for 30 minutes or until the tops are golden brown.