Preheat oven to 350℉ and line an 8x8 baking pan with parchment paper.
In a small saucepan, melt together ½ cup chocolate chips and the butter, stirring frequently over medium-low heat until smooth. Set aside to cool for at least 10 minutes.
Add the cottage cheese, milk, sugar, egg, and vanilla to a food processor and blend until smooth. Add the melted chocolate mixture and blend again until smooth and well combined. Set aside.
Sift together the flour, cocoa powder, and salt into a medium mixing bowl, then pour in the cottage cheese mixture and stir until combined.
Pour the batter into the prepared baking pan and spread the batter into an even layer. Top with the remaining ¼ cup chocolate chips, then bake in the preheated oven for 25-30 minutes, until they appear set on the top and slightly gooey in the middle.
Allow the brownies to cool completely before slicing into 9 squares.