1. Finely dice mushrooms or gently pulse in food processor.
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2. In skillet, warm 1 tablespoon olive oil on medium-high heat and add mushrooms, cooking 5-7 minutes, or until golden brown.
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3. Remove from heat and cool 5 minutes. Transfer cooled mushrooms to medium bowl.
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4. Add ground beef and salt, mixing until combined. Make 4 patties.
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5. Add remaining olive oil to pan and cook burger patties on medium-high heat until internal temperature reaches at least 160 F. Plate and add desired toppings to bun.

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