Step 1

Set the oven to 325°F (163°C) and position the rack in the center. Grease an 8-by-8-inch square baking pan with butter and set aside.

Step 2

In a small mixing bowl, whisk together the flour, baking soda, and salt. Set the mixture aside.

Step 3

In a medium saucepan set over medium heat, combine the granulated sugar, butter, and milk. Stir until the mixture comes to a boil, then immediately remove it from the heat. Add 1½ cups of the milk chocolate morsels and stir until completely melted and smooth.

Step 4

Stir the eggs and vanilla extract into the chocolate mixture until fully blended and glossy in texture.

Step 5

Gradually add the flour mixture to the chocolate base, stirring gently just until the ingredients are incorporated. Avoid overmixing.

Step 6

Pour the batter into the prepared baking pan and spread evenly. Sprinkle the remaining 1 cup of milk chocolate morsels over the surface.

Step 7

Bake for 25 to 30 minutes, rotating the pan halfway through for even baking. The brownies are done when the edges are firm and the center appears set.

Step 8

Allow the brownies to cool in the pan on a wire rack. Once cooled, slice into 6 large squares. Serve as is or top with vanilla ice cream and chocolate sauce if desired.