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Place butter in microwave-safe bowl and cook in microwave until melted, approximately 45-60 seconds.
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Stir in brown sugar and sugar and keep stirring until the mixture is smooth, about 2-3 minutes.
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Stir in vanilla, lemon juice, and eggs.
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In food processor, pulse rolled oats until a fine powder. Add to mixture. Stir in flour, baking soda, and salt until all combined.
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Stir in mini chocolate chips and walnuts.
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Place cookie dough in plastic wrap and wrap tightly. Place in refrigerator to chill.
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The minimum chilling time is 1-2 hours. The ideal chilling time is at least overnight or 24-48 hours.
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Preheat oven to 360 degrees.
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Remove from refrigerator and shape into balls on cookie sheet. If the dough is cold and tightly formed together, use a knife to cut dough sections. It is usually easier to shape into balls once it is in smaller pieces.
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Bake for 11-14 minutes or until golden brown. May sprinkle with a touch of sea salt.