2Add 1/3 cup of sugar, 2/3 cup of flour, and a pinch of cinnamon to the melted butter.
3Mix the streusel ingredients together until combined and set aside.
4Melt 1/2 cup (one stick) of butter for the muffin batter.
5Add one cup of sugar, two eggs, lemon zest, vanilla extract, six tablespoons of Greek yogurt, and six tablespoons of milk to the melted butter and mix.
6Sift in two cups of flour and one tablespoon of baking powder into the wet ingredients.
7Mix the batter gently until it's still a little clumpy.
8Fold in the blueberries carefully to avoid overmixing and turning the batter blue.
9Place the batter into muffin tins.
10Pack the streusel mixture on top of each muffin in the tins.
11Bake in the oven at 375 degrees Fahrenheit for 20 minutes.
Ingredients
0.25 cup butter
0.33 cup sugar
0.66 cup flour
1 pinch cinnamon
0.5 cup butter
1 cup sugar
2 eggs
lemon zest
vanilla extract
6 tablespoons Greek yogurt
6 tablespoons milk
2 cups flour
1 tablespoon baking powder
blueberries
Equipment
muffin tinsoven
Tips
Do not overmix the muffin batter after adding flour; it should still be a little clumpy.
Be very careful not to overmix the blueberries into the batter to prevent it from turning blue.