Espresso Toffee Fudge

Butter-flavored cooking spray
1 stick butter
4 cups sugar
1 (12-ounce) can evaporated milk
2 tablespoons instant espresso powder
1 (12-ounce) package semisweet chocolate chips
30 large marshmallows
1 cup toffee bits (I use the entire bag)

Directions :

Lightly coat 9 by 13-inch baking pan with butter-flavored cooking spray. In a large saucepan over medium heat, combine butter, sugar, evaporated milk, and espresso powder. Stirring constantly, bring to a rolling boil for 10 minutes.
Remove from heat and stir in chocolate chips and marshmallows until blended. Pour into prepared pan. Sprinkle toffee chips evenly over fudge and pat lightly. Cool until set, about 3 to 4 hours. Cut into bite-sized squares.