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1
Preheat the oven to 300 degrees.
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2
Line two baking sheets with parchment.
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3
Toss together all of the dry ingredients except the raisins in a very large bowl.
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4
Combine the oil, honey and vanilla in a saucepan or measuring cup.
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5
Warm over low heat, or heat at 50 percent power in a microwave.
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6
Do not let the mixture come to a simmer.
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7
Stir into the dry ingredients.
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8
Stir to coat evenly.
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9
Spread the granola mixture on the sheet pans, and bake for 45 minutes to 1 hour until golden, stirring every 10 to 15 minutes and switching the pans from lower to middle racks.
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10
Remove from the heat, stir in the raisins if using, and allow to cool on the pans.
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11
Store in well sealed jars, bags or containers.
