Stonehenge — Les Petites Gourmettes

Ingredients

• 1/2 cup (1 stick) unsalted butter, room temperature
• 1/2 cup shortening
• 1 cup sugar
• 2 1/4 cups flour
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 1 egg
• 1 teaspoon vanilla paste or extract
• 5.32-ounce package (9 squares) Ghirardelli Dark & Mint Squares
• plus 1/2 cup chocolate chips (or 1 1/2 cups mint chocolate chips)
• 14-ounce can sweetened condensed milk
• 1/2 cup slivered almonds