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Preheat oven to 375 deg.
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Grease a 12-cup muffin tin.
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Mix flour, oats, baking posder, baking soda and salt.
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In a seperate bowl, beat butter, sugar and eggs until smooth.
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Add half of the dry ingredients to the wet, and half of the yogurt; mix until just combined.
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Add the remaining dry ingredients and yogurt, mix together.
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When they are almost combined, begin folding in the blueberries (gently, so they don't get squashed).
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Fill the muffin tins (they will be very full, which makes for great big muffin-tops).
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Bake for 25-30 minutes, or until a toothpick comes out clean.
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I've had the best results with frozen berries because they stay solid during mixing. Just makes sure you give them a rinse in hot water to get all the ice off them, and even thaw them a bit. Also, dry them off before adding them (you don't want extra moisture).