Mix together butter and cornstarch until well combined. Add in powdered sugar and extract and mix until smooth. Add flour and mix until dough comes together and flour is all incorporated. Cover and refrigerate 10-15
Preheat oven to 350 degrees.
Scoop out about 1/2 a tablespoonful of dough. Roll into a ball and lay on parchment on a cookie sheet. Lay cookie dough balls out 4 across in 5 rows, fitting about 20 cookies per sheet.
Bake 9 minutes. Remove from oven and flatten the tops of each cookie by gently pressing down with the bottom of a glass. Let sit for 2
minutes before transferring cookies to a cooling rack.
Melt 3 TBSP butter. Stir in 1/2 tsp vanilla and 3 TBSP milk. Whisk in 1 cup to 1 1/2 cups powdered sugar. Stir until smooth and desired consistency is achieved. Let cool slightly before spooning onto cookies.
Let cool about 10 minutes. Spoon or pipe glaze on top.
Measure out Chad's Raspberry Jam into a microwave safe container. Place in the microwave for 30 seconds or until it is returns to a partial liquid.
Transfer jam to a small bag and cut the corner to pipe 45 small drops of jam on top of glaze on each cookie. Use a toothpick to swirl the jam and the glaze.
Let cool to set. Store in an airtight container.