This simple yet Chef-Gemma-approved Jumbo Lemon Blueberry Costco Muffins recipe saves you a trip to a crowded Costco! These giant muffins are moist and tender, loaded with beautiful floral flavor from vanilla and sweet blueberries, and elevated with refreshing lemon zest. One bite is enough to convince you that homemade Lemon Blueberry Costco Muffins can be even better and might be your new favorite! | Bigger Bolder Baking