When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.) To add color to the streusel, add 1 to 2 teaspoons food coloring to it while in the stand mixer. Be careful not to roll the streusel too thin or it may begin to break when you remove it from the parchment. You can purchase stencils online for scoring the tops of conchas to get an identical design every time.