Refrigerate your cake mix dough for at least 30 minutes before baking to prevent excessive spreading and ensure thicker, chewier cookies with better structure for sandwich assembly.

Use gel food coloring instead of liquid to avoid thinning the batter, and add an extra 1/4 teaspoon of red coloring beyond the recipe for a deeper, more vibrant red velvet hue.

Use a cookie scoop (1.5-2 tablespoon size) to ensure uniform cookie dimensions, making it easier to match pairs and create professional-looking sandwich cookies with evenly distributed frosting.

Allow cream cheese frosting to soften to room temperature before spreading on cooled cookies to prevent tearing the delicate cake and ensure smooth, even layers without cracking.

Sift 1 tablespoon of unsweetened cocoa powder into the dry cake mix to enhance the traditional red velvet flavor complexity that standard cake mix may lack.