Blackberry Rosemary Butter Coffee Cake

Ingredients

• 1 1/2 cups all purpose flour plus 1 Tbsp (divided)
• 1/2 tsp plus 1/4 tsp baking powder
• 1/2 tsp plus 1/4 tsp baking soda
• 1 1/2 sticks unsalted butter (softened)
• 3/4 cup of granulated sugar
• 1 large egg plus 1 egg yolk
• 3/4 cup sour cream
• 1 tsp vanilla extract
• 1 1/4 cups whole blackberries
• 1 1/2 Tbsp fresh rosemary (finely chopped)
• 1/2 cup packed light brown sugar
• 1/2 cup chopped pecans
• 1 tsp cinnamon