Preheat oven to 350°F (175°C).

Grease a 9x9-inch baking pan with cooking spray and set aside.

Sift together the flour and salt; set aside.

Place the butter and chopped chocolate in a saucepan and melt over low heat, stirring frequently, until melted and smooth.

Remove from heat and stir the sugar into the chocolate mixture; let cool for 3 minutes.

Pour the chocolate mixture into your mixer's bowl and beat in the eggs, one at a time.

Mix in the Baileys Irish Cream.

Stir in the flour mixture with a wooden spoon.

Spread the batter evenly into the prepared pan.

Bake for 30 to 35 minutes, or until a toothpick inserted into the center comes out clean.

Cool in pan on wire rack.

Place all ingredients for the frosting in a large bowl and blend together with your electric mixer; mix until smooth and creamy.

Spread on top of cooled brownies.

Serve.