01 - Preheat the oven to 375°F. Line a 12-cup muffin tin with paper liners or grease thoroughly.
02 - Combine flour, sugar, cinnamon, and salt in a small bowl. Cut in cold butter using fingertips or pastry cutter until mixture resembles coarse crumbs. Set aside.
03 - Whisk together flour, sugar, baking powder, baking soda, salt, and lemon zest in a large bowl.
04 - Whisk eggs, milk, oil, yogurt, lemon juice, and vanilla extract in a separate bowl until smooth.
05 - Pour wet ingredients into dry ingredients. Gently fold until just combined, being careful not to overmix.
06 - Gently fold blueberries into the batter.
07 - Divide batter evenly among the 12 muffin cups. Generously sprinkle streusel topping over each muffin.
08 - Bake for 20 to 22 minutes until a toothpick inserted into the center comes out clean.
09 - Let muffins cool in the pan for 5 minutes. Transfer to a wire rack to cool completely before serving.