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Preheat oven to 350 degrees F. Grease and flour a 9- X 5-inch loaf pan.
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In a small bowl, whisk or stir together the brown sugar and 2 teaspoons cinnamon.
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In a large bowl, whisk together the flour, baking powder, baking soda, salt, remaining 1/2 teaspoon cinnamon, and sugar.
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In a medium bowl, whisk together the melted butter, eggs, vanilla, yogurt, and milk until thoroughly combined.
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Pour the wet ingredients into the large bowl with the dry ingredients. Stir until just combined.
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Spread 1/3 of the batter into the prepared loaf pan. Sprinke 1/2 of the brown sugar/cinnamon mixture evenly over the batter.
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Repeat with 1/3 more of the batter and remaining 1/2 of brown sugar cinnamon mixture.
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Spread remaining 1/3 of the batter on top.
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Bake for 50 to 60 minutes, until a toothpick or cake tester inserted into the center comes out clean.
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Cool bread in the pan for 10 minutes. Remove bread from the pan and cool completely on a wire rack.