Preheat the oven to 350-degrees F. Line a 9x9 square baking pan with parchment paper so that it hangs over the sides. (This will make the bars easier to remove).
Add the butter and brown sugar to the bowl of an electric mixer fitted with a paddle attachment. Beat until fluffy. Add the vanilla extract and mix to combine.
1 cup unsalted butter, ½ cup brown sugar, 1 teaspoon vanilla extract
Scrape down the sides of the bowl and then add in the flour and salt slowly, with the mixer set on the lowest speed.
2-¼ cups all-purpose flour, pinch of salt
Once the mixture is combined, press it into the prepared pan. Bake for 15 minutes until the edges of the crust are golden brown.
Remove from the oven and set on a wire rack.
Sprinkle the crust with the chopped pecans and shredded coconut.
1 cups chopped pecans, 1 cup shredded coconut
Pour the sweetened condensed milk over the top and then add the mini semisweet chocolate chips, toffee chips and dark chocolate chips.
1 14oz can sweetened condensed milk, 1 cup toffee chips, 1 cup mini semi-sweet chocolate chips, ¾ cup dark chocolate chips
Place the pan back in the oven and bake for another 20-25 minutes. Remove to a wire rack to cool completely.
Refrigerate for 30 minutes before using the parchment paper to remove the bar from the pan. Cut into squares and store in an airtight container for up to 1 week.