2ouncesSemisweet Chocolate Baking Squaresdo NOT use chips; they have stabilizers in them that prevent them from fully melting.
Instructions
Chocolate Drop Cookies
In an electric mixer, cream together butter, shortening, and both sugars until light and fluffy. Add vanilla and egg.
Add bittersweet chocolate baking squares to a microwave-safe bowl and microwave in 30-second intervals until melted. Let cool before adding to the mixing bowl.
In a separate bowl, whisk together flour, cornstarch, baking soda, baking powder, and salt. Add dry ingredients to the mixing bowl.
Using a 1.5 tablespoon cookie scoop, add mounds of cookie dough to a parchment-lined baking sheet. Refrigerate for 1 hour. This prevents spreading while they bake.
After an hour, preheat the oven to 400℉. Place the baking sheet directly from the fridge into the oven and bake for 11-13 minutes until the tops are set and the centers are still soft.
Chocolate Buttercream Frosting
Add butter to a mixing bowl with a whisk attachment and beat the butter for 3-4 minutes until it's fluffy and beginning to turn white in color.
Add cocoa powder and vanilla. Slowly add powdered sugar until well combined. Add 1-2 tablespoons of milk until reaching the desired consistency.
Add heavy whipping cream to a microwave-safe dish. Microwave for 30-40 seconds until it begins to steam, but does not boil. Add chocolate squares to the dish and stir until fully melted and blended well.