In a mixing bowl, beat the softened butter and brown sugar with an electric mixer until creamy.
Mix in the vanilla extract and milk until combined.
Gradually add the heat-treated flour and stir until a dough forms.
Fold in the mini chocolate chips.
Scoop small portions of dough and shape them into egg-like ovals.
Place the shaped dough onto a parchment-lined baking sheet and refrigerate for 20 minutes.
In a microwave-safe bowl, melt the white chocolate chips in 30-second intervals, stirring between each interval.
Divide the melted chocolate into separate bowls and tint each with pastel food coloring.
Dip each chilled cookie dough egg into the colored chocolate, ensuring it is fully coated, then place back on the parchment paper.
Decorate with sprinkles while the chocolate is still wet.
Refrigerate for 10 minutes or until the chocolate is fully set before serving.