To make scones: Stir vanilla into cream. Let sit for at least 15 minutes. Mix together flour, sugar, baking powder, and salt. Cut in butter until mixture resembles coarse crumbs. Mix together vanilla cream and egg. Add to flour mixture and combine just until it comes together. Turn dough onto a floured surface and knead lightly into a rectangle. Roll out to 1/2? to 3/4? thick. Cut into 12 squares, then cut each square diagonally to form triangles. Place on a baking sheet at least 1 inch apart. Bake in a preheated 350 degree (F) oven. Bake about 18 minutes, until slightly light golden brown. Cool on baking sheet for 15 minutes before removing to a wire rack to cool completely.
To make glaze: Mix together powdered sugar, milk, and vanilla. Add a little more powdered sugar or milk to achieve a runny consistency. One at a time, dip scones in glaze. Let scones sit until glaze sets. Store in an airtight container.