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Preheat oven to 350 degrees F.
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Beat together butter, sugar, salt, and cinnamon until fluffy. Add eggs, one at a time, beat until incorporated after each addition. Add vanilla and sour cream, mix well.
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In a medium bowl, combine flour and baking powder. Add flour mixture to wet ingredients in two additions; mix until just combined after each addition.
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Spray loaf pan with non-stick spray and pour batter into pan. Fill 2/3 full, DO NOT over fill!!
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Mix topping ingredients together and distribute evenly over top batter. You will think there is too much of the topping. It’s okay…use it all.
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Bake 50 minutes to 1 hour, until a toothpick inserted in the center comes out clean. Cool in pan.