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Preheat oven to 400 degrees F and lightly grease 2-cup muffin tin.
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In large bowl, whisk together all-purpose flour, baking powder, baking soda, granulated sugar, garlic powder, kosher salt and black pepper.
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In separate bowl, whisk buttermilk, eggs, canola oil and melted butter until smooth and fully combined.
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Pour wet ingredients into dry ingredients. Fold gently with spatula just until no dry pockets remain.
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Gently fold in cheddar and chives, stopping as soon as they’re evenly distributed.
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Divide batter evenly among 12 cups until each cup is nearly full. Sprinkle tops with extra cheddar and pinch of flaky salt, if desired.
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Bake at 400 degrees F 5 minutes, then reduce oven to 375 degrees F and continue baking 12-15 minutes, until tops are lightly golden and toothpick inserted in center comes out clean.
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Let muffins cool in pan 5 minutes, then transfer to cooling rack.