Cream butter until fluffy. Add sifted confectioners' sugar gradually, scraping bowl occasionally. Mix two eggs at a time and add to batter; beat between additions. Add the sifted cake flour and baking powder gradually, beatingbetween additions. Add vanilla and mix in.
Pour into a 10-inch greased tube pan and bake at 350 degrees for approx. 60-70 minutes. When a toothpick comes out clean, it's done.
Let cool in pan for 5-10 minutes. Then cool on rack. When completely cool, frost.
Buttercream Frosting
Beat butter until fluffy. Add confectioners' sugar gradually, beating between additions. Add heavy cream and vanilla and beat until smooth.
Spread over cake.
Optional: Lay strawberry halves around the top.