Preheat oven to 400 degrees and line a baking sheet with parchment paper.
Whisk together sour cream, vanilla, egg and Irish Cream liqueur in a small bowl. Set aside.
Add flour, baking powder, sugar and salt to food processor. Pulse a few times to combine.
Add butter to flour mixture in food processor and pulse until mixture has pea-size lumps covered in flour.
In large bowl, stir together flour mixture and baking chips.
Add wet ingredients to flour mixture stirring until just combined. Dough will be crumbly but will come together when baked.
Turn dough out onto prepared baking sheet and gently form into an 8-inch round.
Use a sharp knife or bench scraper to cut round into 8 wedges. Pull scones apart, separating about 1 inch from one another.
Chill scones in refrigerator for minimum of 15 minutes up to an hour before baking.
Remove from refrigerator and brush top of scones with heavy cream and sprinkle with coarse sparkling sugar.
Bake for 18-23 minutes or until golden and baked through. Remove from pan and cool completely on rack.