Preheat the oven to 350 degrees F. Line a 12-cup muffin pan with paper liners.
Spread the oats on a rimmed baking sheet and cook until lightly toasted, 8 to 10 minutes; cool completely.
Combine the toasted oats, flour, baking powder, salt and baking soda in a large bowl. Whisk together the oil, sour cream, brown sugar, vanilla, lemon zest and eggs in another large bowl. Fold the sour cream mixture into the flour mixture until just combined (a few lumps are okay), and then fold in the raspberries.
Divide the batter evenly among the prepared muffin cups. Sprinkle with turbinado sugar. Bake until the muffins are golden and a toothpick inserted in the center comes out clean, about 20 minutes. Cool in the pan for 5 minutes, and then transfer to a wire rack to cool completely.
When measuring flour, we spoon it into a dry measuring cup and level off the excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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