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Preheat oven to 375° F. Line a 13" x 9" baking pan with parchment paper or foil, extending paper/foil over the edges.
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Beat butter with an electric mixer on medium for 30 seconds. Add brown sugar, 1/2 tsp salt, and baking soda. Beat on medium until combined, scraping done sides every so often.
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Beat in eggs and vanilla. Beat in flour.
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Stir in 1 cup chocolate chips and toffee pieces.
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Press dough down into prepared pan.
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Bake for 22-27 minutes or until light brown and middle is set. Cool in pan, on a wire rack for 1 hour.
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Preheat oven to 325° F. Using foil lift out baked cookies.
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Cut in half lengthwise and then cut into 1/2" thick sticks. Place cut side down on an ungreased large cookie sheet. Bake 10-15 minutes until cut edges are dry.
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Carefully remove from and cook on wire racks.
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In a bowl combine remaining 1 cup chocolate chips and 2 tbsp butter in a small bowl. Melt in the microwave, stirring every 20 seconds (when's there's only a couple of lumps left take it out and stir to melt the rest).
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Dip cooled cookies sticks into melted chocolate and place on a wire rack to dry. Sprinkle with flaky sea salt. Allow chocolate to set, about 30 minutes.