apple ginger streusel coffee cake

Ingredients For apple ginger streusel coffee cake

• 1/3 c

  brown sugar, packed
• 3/4 tsp

  ginger
• 1/4 tsp

  cinnamon
• 3 Tbsp

  flour
• 1/4 c

  unsalted butter
• 1/3 c

  finely chopped walnuts
• 1 tsp

  baking powder
• 1 tsp

  baking soda
• 1/2 tsp

  salt
• 1/4 c

  finely chopped crytallized ginger
• 6 Tbsp

  unsalted butter, at room temperature
• 3/4 c

  dark brown sugar, packed
• 1/2 c

  sugar
• 2 tsp

  vanilla
• 3

  large eggs
• 1-1/4 c

  buttermilk
• 1

  medium granny smith or golden delicious apple, chopped coarse
• 2-1/4 c

  flour
• 1/2 tsp

  ginger
• pinch nutmeg