Blueberry muffins

Blueberry Muffins (from a friend)

Mix together the following three dry ingredients:

2 1/2 cups flour
1 1/4 cup sugar ( I never use that much, more like 3/4 cup cane sugar)
1 Tbsp. baking powder

Cut in 1 cup of softened butter.
Remove 3/4 cup and add 1/2 tsp. cinnamon to this and set aside for streusel topping (not pictured on this batch)
To the rest of the batter, add 3/4 cup milk, 2 eggs and 1 1/2 tsp. vanilla.
Stir until just moistened.
Fold in 2 cups blueberries.
Put in muffin tins.
Top with streusel topping mixture.
Bake at 350 for 30-35 minutes, check after 20 minutes and adjust time as necessary.