In a large bowl, beat together the butter and sugar until light and fluffy.
Add in eggs one at a time, mixing after each addition. Mix in the Greek yogurt.
In a small mixing bowl, combine the flour and baking soda. Add to the wet ingredients and stir until combined. (If using food coloring, stir it in now.)
Pour batter into an 8-inch x 4-inch greased loaf pan.
Bake for 50 to 60 minutes or until a toothpick comes out clean when inserted into the center.
Remove from oven and allow to cool completely on a wire rack.
Champagne Glaze
Whisk together the powdered sugar and champagne until smooth.
Pour over the top of the pound cake and allow to run down the sides of the cake.