Mango streusel cake recipe

Ingredients

• 2 cups all purpose flour
• ¾ cup unsalted butter
• 1.5 cup sugar
• 1 cup fresh mango puree ( thick puree)
• 1 teaspoon vanilla essence
• ½ cup chopped mango
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• ½ teaspoon salt
• 2 eggs
• ½ cup walnuts- finely ground
• ½ cup brown sugar
• ½ teaspoon nutmeg or cardamom ( optional)
• ¾ cup flour
• ½ cup butter