How to Make It
Prepare the Muffin Batter: Preheat oven to 375°F. Line a 12-cup muffin tin with paper liners or coat lightly with cooking spray. Whisk together flour, baking powder, and salt in a large bowl.
Whisk together sugar, butter, milk, vanilla, and eggs in a separate medium bowl; add to the flour mixture, stirring just until combined. Gently fold in blueberries. (Do not overmix.) Divide batter evenly among liners in prepared muffin tin.
Prepare the Streusel: Combine sugar, flour, oats, and cinnamon in a small bowl; add butter, and toss well to combine. Stir in almonds, pinching to incorporate. Sprinkle streusel evenly over tops of batter.
Bake until a toothpick inserted in the center of a muffin comes out clean, 20 to 23 minutes. Cool in pan 5 minutes. Serve warm or room temperature.