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Add the oats and chopped walnuts to a large mixing bowl.
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In a separate bowl, combine the butter, brown sugar, honey, and vanilla and mix. Drizzle over the oats and nuts and stir.
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Line a large cookie sheet with foil and spray lightly with cooking spray.
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Spread the granola evenly over the cookie sheet.
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Bake at 250 degrees for 35-40 minutes.
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If adding coconut, add it after the 35-40 minutes. Stir the granola.
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Bake for another 45 minutes, stirring every 15 minutes.
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Remove from the oven and stir in the banana chips.
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Let cool.
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Store at room temperature.