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If using fresh blueberries, preheat oven to 400 degrees now - if using frozen, wait and read on.
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In a large bowl whip the eggs then mix in the sugar until well blended.
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Add in the Yogurt, Vanilla & Oil, mix well
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Sprinkle on 1 C Flour, then add the baking powder & salt - fold in gently - NO OVERMIXING
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Sprinkle on the remaining 1 C flour and fold in gently.
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Add the blueberries and fold until just combined.
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Using the method described above for jumbo muffins - divvy out the batter and set your muffin tins on top of the stove - if you're using frozen berries - let them sit while the oven preheats to 400 degrees. In the mean time, make your streusel topping.
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In a small bowl pour in the melted butter - add on top of the butter the flour, powdered sugar, cinnamon and salt. Mix gently with your fingers until crumbles form. Set aside.
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When batter in muffin cups has relaxed top with streusel and slide into oven.
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Reduce heat on oven to 375 degrees and bake for approx 25 minutes until a toothpick comes out of the center clean.
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Enjoy!