Preheat oven to 350°F.
Combine flour, salt and brown sugar.
Cut in the butter with a pastry blender or fork until the mixture is crumbly.
Add the eggs and stir to incorporate.
Stir in 1 1/2 cups of the chocolate chips.
Set aside 1 1/2 cups of the dough and press the remaining dough into a greased 9×13” baking pan.
Bake for 10 minutes.
Remove from oven and pour the sweetened condensed milk evenly over the baked crust.
Gently spread it into an even layer.
Reserve 1/3 cup of the toffee bits and then sprinkle the remaining toffee bits on top.
Sprinkle remaining dough over the toffee bits and then sprinkle with remaining 1/2 cup of chocolate chips.
Bake for 25-30 more minutes, or till golden brown.
Sprinkle the remaining 1/3 cup of toffee bits on top.
Cool completely before serving.