blackberry brown sugar coffee cake

Ingredients For blackberry brown sugar coffee cake

• 1/2 c

  unsalted butter
• 1 1/2 c

  light brown sugar
• 2

  eggs
• 2 c

  flour
• 1 tsp

  baking soda
• 1 tsp

  cinnamon
• 1/2 tsp

  salt
• 6 oz

  greek vanilla yogurt
• 1 tsp

  vanilla extract
• 2 c

  wild blackberries
• CRUMBLE
• 1/2 c

  light brown sugar
• 1/2 c

  flour
• 1/2 tsp

  cinnamon
• 4 Tbsp

  unsalted butter (cold)