Preheat oven to 325. Spray mammoth muffin pan or use paper baking cups.
2
Whisk together flour, baking soda, baking poeder and salt. Set aside.
Cream together margerine and sugar. Add eggs and mix well. Stir in sour cream and vanilla until well combined.
3
Gently fold in floue a third at a time adding blueberries along with the last third of flour mix just until blended. DO NOT overmix.
4
Evenly fill 12 muffin cups (should be 3/4 full). Sprinkle with coarse sugar and cinnamon, if desired.
Bake at 325 for 28-35 minutes until toothpick inserted comes out clean. Cool on rack 10 minutes. Remove from pan. Serve warm or cold.
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