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Preheat oven to 350 degrees. Line 8x8 or 9x9 square baking dish with foil or parchment paper.
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Combine powdered sugar and flour in a large bowl.
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Cut butter into flour mixture using a pastry cutter or two knives, until mixture resembles small pea like crumbs.
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Press dough into the pan evenly.
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Bake crust for 10 minutes. Remove from oven and cool for 5 minutes.
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Once crust has cooled slightly, sprinkle with toffee bits followed by chocolate chips.
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Drizzle condensed milk over chocolate chips.
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Bake mixture until edges begin to turn golden and filling is set, about 22-25 minutes.
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Remove from oven and cool completely before slicing.
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For more even cuts, chill for one hour before slicing into squares.