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Preheat oven to 350 degrees F.
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Grease an 8x8 inch baking pan.
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In a small saucepan, melt butter over low heat.
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After melted, transfer butter to a medium bowl.
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Add sugar and beat until very smooth (either with an electric mixer or by hand with a whisk).
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Add egg, vanilla, orange extract, and salt and beat until combined, scraping down sides as necessary until you have a uniform mix.
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Gently stir in the flour until just combined.
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Pour mixture into prepared pan and bake 25-28 minutes, or until just set in the middle.
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Cool on a rack before cutting.