My Grandma's New England Coffee Cake Recipe

Ingredients

• 2 cups (250g) all-purpose flour
• 1 cup (200g) granulated sugar
• 1/2 cup (115g) unsalted butter, softened
• 1 cup (240ml) buttermilk
• 3 large eggs
• 1 tsp baking soda
• 1 tsp baking powder
• 1/2 tsp salt
• 1 tsp ground cinnamon
• 1/2 tsp ground nutmeg
• 1 tsp vanilla extract
• 1 cup (125g) all-purpose flour for streusel
• 3/4 cup (150g) light brown sugar, packed
• 1/2 cup (115g) unsalted butter, melted for streusel
• 1 tsp ground cinnamon for streusel
• 1/2 cup (75g) chopped walnuts or pecans (optional)