I’m so in love with these muffins right now. They are packed with a variety of berries like strawberries, blueberries, blackberries, and raspberries. If you are having berry muffins, you would want to have lots of berries in each and every muffins right? This recipe will sure to satisfy you. And with a generous amount of buttery crumble topping. This is to-die-for. Bring it on your next potluck! Your friends will love it.