Cinnamon coffee cake

2 cups flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
1/4 cup butter (room temperature)
1 cup white sugar
2 large eggs
1 teaspoon vanilla extract
1/2 teaspoon lemon zest
1 cup buttermilk (milk + 1Tb. vinegar left to rest for 5 minutes)
1 cup brown sugar
2 heaping tablespoons ground cinnamon

Mix the flour, baking soda, baking powder, and salt in a bowl. Cream the butter and sugar in another bowl. Beat in the eggs, salt, vanilla and lemon zest. Gradually incorporate the dry and wet ingredients, slowly adding the milk to keep batter consistency correct. Mix the brown sugar and cinnamon in a bowl. Pour 1/3 of the batter into a greased 9x5 inch loaf pan. Pour 1/3 of the cinnamon mixture on top. Repeat two more times, pour the remaining cinnamon mixture on top. Bake in a preheated 350F oven until a toothpick pushed into the center comes out clean, about an hour.