Ingredients

  • 3 34 cups all-purpose flour
  • 12 teaspoon salt
  • 4 ounces white chocolate, finely chopped (such as Callebaut or Ghiradelli)
  • 1 12 cups unsalted butter, at room temperature, cut into tablespoon-sized pieces
  • 12 cup granulated sugar
  • 12 cup light brown sugar, packed
  • 1 tablespoon instant espresso powder
  • 2 teaspoons vanilla extract
  • 1 14 cups semisweet chocolate chunks
  • 7 ounces chocolate-covered english toffee bars, such as Heath Bars, chopped (5, 1.4 oz bars cut into1/2-inch pieces)

Method

  • Preheat oven to 325 degrees.
  • Line 2 cookie sheets with parchment paper.
  • Whisk flour and salt together in a small bowl to aerate and combine; set aside.
  • Melt the white chocolate in top of double boiler or microwave; stir until smooth.
  • In a large bowl with an electric mixer on medium-high speed, beat butter until creamy, about 2 minutes.
  • Add sugar and brown sugar gradually, beating until light and fluffy, about 3 minutes, scraping down the bowl once or twice.
  • Dissolve the instant powder in the vanilla, then beat into butter mixture.
  • Beat in melted white chocolate.
  • Add about one-third of flour mixture and mix on low speed.
  • Gradually add remaining flour mixture, mixing just until blended.
  • Stir in chocolate chunks and chopped toffee bars.
  • (You may freeze dough up to 1 month; defrost in refrigerator overnight before proceeding).
  • Drop by generously rounded tablespoon 2 inches apart on cookie sheets.
  • Flatten cookies with palm of hand to about 1/2-inch thickness.
  • Bake for about 25 minutes or just beginning to turn light golden brown.
  • The centers will still be a bit soft.
  • Place sheets on racks to cool cookies for 2 minutes, then remove cookies from sheets and place directly on racks to cool.