Tiff Treats in Sugar Land just Introduced Blueberry Muffin Cookies! Take everything you love about a soft blueberry muffin and combine it with everything you love about that classic Tiff Treats cookie taste, multiply that by ten, and that's what Blueberry Muffin Cookies are like. Made with real blueberries and topped with sanding sugar, these limited time treats won't last long. Look out, morning; cookies have joined the breakfast table.