Preheat your oven to 350°F. This step is crucial for ensuring the muffins bake evenly and rise properly. While the oven warms up, prepare your muffin tin by greasing it with nonstick spray or lining it with paper liners. This will prevent the muffins from sticking and make cleanup a breeze.
In a medium bowl, combine the 2 cups of all-purpose flour, 1 teaspoon of baking powder, and ¾ cup of granulated sugar. Whisk these dry ingredients together until they are well mixed. This ensures even distribution of the leavening agent and sugar, which is essential for consistent baking results.
In another bowl, whisk together the 1 large egg, ¼ cup of Greek yogurt, ⅓ cup of vegetable oil, 1 cup of milk, and 1 teaspoon of pure vanilla extract. Mixing these wet ingredients thoroughly will help to create a uniform batter. The yogurt adds a wonderful creaminess and moisture, enhancing the muffins' texture.
Now, pour the wet mixture into the bowl of dry ingredients. Mix gently until the ingredients are just combined. Be careful not to over-mix; it's okay if there are a few lumps. Over-mixing can lead to dense, chewy muffins, and we want them light and fluffy.
Next, gently fold in 1 cup of chopped mixed berries into the batter. Use a spatula to carefully incorporate them, ensuring they are evenly distributed without breaking them apart. This is where you'll see the beautiful colors and get excited about the delightful flavors to come.
Using a cookie portion scoop, fill each muffin well about two-thirds full with the batter. This allows room for the muffins to rise without overflowing. Make sure to scrape the batter from the scoop for even portions.
Place the muffin tin in the preheated oven and bake for about 20 minutes. You'll know they're done when the tops are golden brown, and a toothpick inserted into the center of a muffin comes out clean. Keep an eye on them towards the end of the baking time to prevent over-baking.
Once baked, remove the muffins from the oven and let them cool in the pan for about 10 minutes. This allows them to set before transferring them to a cooling rack. Enjoy the aroma filling your kitchen as they cool!
Transfer the muffins to a cooling rack to cool completely. This step is important, as it helps keep the bottoms from becoming soggy. Enjoy your Mixed Berry Muffins warm or at room temperature!