For the Blueberry Coffee Cake
Preheat oven to 350F. Line the bottom of a tube pan with parchment paper and spray the sides with non-stick baking spray.
In a large bowl, combine the dry ingredients; flour, baking soda, baking powder and salt. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat butter, sugar, brown sugar and vanilla paste, until fluffy and pale. This can take 5-6 minutes beating on medium-low. Add one egg at a time, while beating, followed by the lemon zest, until fully incorporated.
Alternate adding the dry ingredients and Greek yogurt, in 2 or 3 additions, beginning and ending with the dry ingredients.
Fold in blueberries.
Spoon batter into the prepared tube pan, spreading evenly using the back of a spoon or an angled spatula.
Evenly sprinkle the pecan streusel over the batter. Bake for 45-50 minutes, until toothpick inserted into the center comes out clean. Serve warm with extra butter!
To make the streusel: in a small bowl, add the brown sugar, flour, cinnamon, salt, chopped pecans and cold butter. Mix together using your hands until you have a crumbly mixture.