Combine flour, 1/4 cup sugar, baking powder, baking soda, and salt in a large, shallow mixing bowl.

Using a pastry blender, cut in butter until mixture resembles coarse crumbs. (Get tips here.)

In a small bowl, combine egg, yogurt, vanilla, and milk.

Pour liquid ingredients into dry ingredients. Stir with a fork, until ingredients are just combined.

Drop shortcake batter into 6 mounds on a greased baking sheet.

Bake at 400 degrees for 13-16 minutes, until golden brown.

Remove from oven and let cool on the baking sheet for 3-5 minutes. Move shortcakes to awire rack to cool completely

While the shortcakes are baking, combine sliced strawberries and 3 Tablespoons sugar. Toss to coat strawberries, and refrigerate until use.

When the shortcakes are cool, cut in half with a knife. Layer bottom half of short cake, strawberries, whipped cream, and top with shortcake. Garnish with extra berries and whipped cream.