Preheat oven to 350°F (175°C).
Line an 8×8-inch baking pan with parchment paper.
In a large bowl, whisk melted butter and sugar until smooth.
Add eggs and vanilla; mix well.
Stir in red food coloring until evenly combined.
Sift cocoa powder, flour, and salt together.
Gradually fold into the wet mixture.
Mix just until combined—do not overmix.
Fold in white chocolate chips or swirl in cream cheese if desired.
Pour batter into prepared pan and smooth the top.
Bake for 25–30 minutes, until a toothpick inserted comes out with a few moist crumbs.
Let brownies cool completely in the pan before slicing.
This helps them set and keeps the texture fudgy.