Directions
<ol class="no-list-style"><li class="MethodStepper"><h4 class="step-title">Step 1</h4>Preheat your oven to 205°C (400°F). Line a 12-cup muffin tin with paper liners or grease well with butter. Position your oven rack in the middle position for even baking.</li><li class="MethodStepper"><h4 class="step-title">Step 2</h4>First, make the streusel topping. In a medium bowl, whisk together the flour, granulated sugar, brown sugar, and cinnamon. Add the cold cubed butter and use your fingertips to work it into the dry ingredients until you have a crumbly mixture with some pea-sized pieces of butter still visible. This texture is crucial for that classic crumbly topping. Place in the refrigerator while you prepare the muffin batter.</li><li class="MethodStepper"><h4 class="step-title">Step 3</h4>In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until well combined. The thorough mixing of dry ingredients ensures even leavening throughout your muffins.</li><li class="MethodStepper"><h4 class="step-title">Step 4</h4>In a separate bowl, whisk together the buttermilk, melted butter (cooled slightly so it doesn't cook the eggs), eggs, and vanilla extract until smooth. The acidity in buttermilk reacts with the baking soda to create a tender crumb and help the muffins rise beautifully.</li><li class="MethodStepper"><h4 class="step-title">Step 5</h4>Toss the blueberries with 1 tablespoon of flour in a small bowl until lightly coated. This flour coating prevents the berries from sinking to the bottom of your muffins and helps prevent bleeding of color into the batter.</li><li class="MethodStepper"><h4 class="step-title">Step 6</h4>Make a well in the center of the dry ingredients and pour in the wet ingredients. Gently fold together with a rubber spatula just until all flour disappears. The batter will look thick and lumpy - this is perfect! Overmixing develops gluten and results in tough muffins, so a few lumps are actually desirable.</li><li class="MethodStepper"><h4 class="step-title">Step 7</h4>Very gently fold in the flour-coated blueberries, taking care not to crush them or overmix the batter. You want to maintain those pockets of juicy blueberry throughout the muffins.</li><li class="MethodStepper"><h4 class="step-title">Step 8</h4>Using an ice cream scoop or large spoon, divide the batter evenly among the prepared muffin cups, filling them completely to the top. This may seem like too much, but filling the cups completely is the secret to achieving those tall, domed tops that Tim Hortons muffins are famous for.</li><li class="MethodStepper"><h4 class="step-title">Step 9</h4>Remove the streusel topping from the refrigerator and generously sprinkle it over each muffin, gently pressing it slightly into the batter so it adheres during baking.</li><li class="MethodStepper"><h4 class="step-title">Step 10</h4>Bake at 205°C (400°F) for 5 minutes, then, without opening the oven door, reduce the temperature to 180°C (350°F) and continue baking for 20-22 minutes until the tops are golden brown and a toothpick inserted into the center comes out clean or with a few moist crumbs. This initial high-temperature burst creates that classic high-domed "muffin top" that's the hallmark of bakery-style muffins.</li><li class="MethodStepper"><h4 class="step-title">Step 11</h4>Allow the muffins to cool in the tin for 5 minutes before transferring to a wire rack to cool completely. If you try to remove them too soon, they may break apart as they're still quite tender when hot.</li><li class="MethodStepper"><h4 class="step-title">Step 12</h4>Store completely cooled muffins in an airtight container at room temperature for up to 2 days or in the refrigerator for up to 1 week. These muffins also freeze beautifully - wrap individually in plastic wrap, then place in a freezer bag for up to 3 months. Thaw at room temperature or microwave for 20-30 seconds to enjoy a fresh-tasting muffin anytime!</li></ol>