Cinnamon Coffee Cake

Ingredients

• ½ cup (125 mL) unsalted butter, room temperature
• 1 1/2 cups (375 mL) granulated sugar
• 3 large eggs, room temperature
• 1 tsp (5 mL) vanilla extract
• ¾ cup (175 mL) sour cream
• 3/4 cup (175 mL) lentil puree*
• 2 1/2 cups (625 mL) cake flour, reserve 2 tsp for pan
• 2 tsp (10 mL) baking powder
• ½ tsp (2 mL) baking soda
• 1 tsp (5 mL) cinnamon
• ¼ tsp (1 mL) ground ginger
• ½ tsp (2 mL) kosher salt
• ¼ cup (60 mL) light brown sugar, packed
• ½ cup (125 mL) all-purpose flour
• 1 tsp (5 mL) ground ginger
• ¼ tsp (1 mL) kosher salt
• 3 Tbsp (45 mL) cold unsalted butter, grated
• ½ cup (125 mL) chopped walnuts (optional)