These red white and blue muffins are a great treat for any occasion but they're especially fitting for patriotic holidays like Memorial Day and the Fourth of July!
Prep. Preheat the oven to 400°F and line a muffin pan with paper liners or grease well.
Brown Butter. Melt the butter in a skillet over medium heat, cooking until browned and fragrant, about 5 to 8 minutes. Transfer to a bowl, including the browned bits, and let cool completely. Chill briefly if needed.
Mix Dry Ingredients. In a large bowl, whisk together the flour, granulated sugar, baking powder, baking soda, salt, and cinnamon.
Mix Wet Ingredients. In a separate bowl, whisk together the cooled browned butter, buttermilk, vanilla extract, and eggs until combined.
Combine Batter. Pour the wet ingredients into the dry ingredients and stir just until combined.
Add Mix Ins. Gently fold in the blueberries, strawberries, and white chocolate chips.
Bake. Divide the batter evenly between muffin cups, filling about ¾ full. Bake for 20 minutes, or until a toothpick inserted in the center comes out clean.
Cool. Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.
Notes
Buttermilk Substitute. Mix 1 tablespoon lemon juice or vinegar with 1 cup milk and let sit for 5 minutes.
Berries. Fresh or frozen berries work well. Do not thaw frozen berries before using.
Oven Placement. Bake on the center rack for even cooking.
Storage. Store muffins in an airtight container for 3 to 5 days or freeze for up to 3 months.