01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper.
02 - Combine flour, melted butter, sugar, and salt in a bowl until crumbly dough forms. Press evenly into bottom of prepared pan.
03 - Bake base for 10 minutes until lightly golden.
04 - Melt semi-sweet chocolate chips with sweetened condensed milk in a small saucepan over low heat, stirring constantly until smooth.
05 - Spread chocolate mixture evenly over the baked crust.
06 - Sprinkle with chopped nuts, mini chocolate chips, and coconut if using.
07 - Bake for an additional 15 minutes until edges are set.
08 - Cool completely in pan, then lift out and cut into bars.