Preheat oven to 350℉. Spray mini fluted cake pan with olive oil spray and set aside.
In a medium bowl, combine flour, baking powder, and soda with whisk.
To soften butter, microwave in its wrapper for 15-20 seconds on high.
In a medium to large mixing bowl, add butter, sugar, and salt. Using an electric mixer, beat until mixture becomes smooth and is lighter in color.
Add the egg and beat until well incorporated and mixture is smooth again.
Add the yogurt, milk, and vanilla. Beat well and scrape down sides of bowl as necessary.
Pour in flour mixture and beat until combined and no lumps are visible.
Using a large cookie-type scoop, transfer batter evenly into wells of mini fluted pan.
Tap pan on counter to even out batter.
Bake for 20-25 minutes or until toothpick inserted into center comes out clean.
Allow cakes to cool for 5 minutes in pan and then invert onto cooling rack and cool completely before adding chocolate glaze.