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Combine and sift together the dry ingredients.
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Whisk together oil and melted butter, then whisk into remaining liquid ingredients. Whisk to break up the eggs.
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Using a rubber spatula, fold together liquid into dry.
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Add berries when the batter is mixed halfway. Do not over mix. Batter should be rough and lumpy, not smooth.
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Spray 12 standard-size muffin tins with non-stick spray or line with muffin papers.
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Using a #16 scoop, scoop the batter from along the sides of the bowl, being careful not to stir the batter. Deposit 2 ½ oz. batter into standard muffin tins. Muffin tins should be about 2/3 full.
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Top with streusel if desired. (optional)
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Bake at 350° for 15 to 20 minutes.