-
Preheat oven to 350.
-
In a medium bowl, whisk together flour, baking powder and salt.
-
In a large mixing bowl, add butter and sugar - beat together until smooth. Add in the eggs, one at a time, beating until well combined. Be sure to scrape down the sides at least once. Mix in vanilla. Add the flour mixture and toffee bits - gently mixed until well combined.
-
Scoop the dough onto a parchment lined baking sheet and shape into a 14" long by 2 1/2" wide log. This dough will be a bit sticky, so use wet fingertips to help you along in shaping. It should be about 3/4" thick.
-
Place in the oven and bake until the top feels firm - about 25 minutes. Remove the pan from the oven and reduce the temperature to 325. Let cool for 15 minutes, then lightly spritz the log with water - then let sit for 5 more minutes. Use a serrated knife to cut the log into 3/4" thick diagonal slices.
-
Place the sliced pieces upright back on the baking sheet and return it to the oven. Bake until the biscotti are a light golden - about 25-30 more minutes. Remove and place on a wire rack to cool completely.