Tip #1: Use room temperature eggs, butter, and Greek yogurt. Generally speaking, cold ingredients don't mix as well together as room temperature ones do.
Tip #3: After combining wet and dry ingredients, gently fold them together with a spatula. This will make it less likely that you'll over-mix your batter.
Tip #4: After distributing batter evenly into the pan, sprinkle about half a teaspoon of turbinado sugar onto each muffin's top. This gives them added crunch and texture.
Tip #5: Bake muffins at 425°F for 5 minutes, then, keeping the muffins in the oven, lower the temperature to 375°F. This helps them rise and create a nice, domed top.