Preheat oven to 350 degrees. Place butter in a medium microwave safe mixing bowl. Heat in microwave on HIGH power until almost fully melted.
Add brown sugar, 1 Tbsp egg, flour, oats, baking soda, cinnamon and salt to melted butter. Stir until well blended (it will seem dry at first but it will start to come together). Add raisins and nuts and mix.
Shape dough into a 3 1/2-inch disk on a Silpat or parchment paper lined baking sheet. Bake in preheated oven 13 - 15 minutes until edges are golden but center is still soft. Cool slightly and enjoy!
*To get this, just crack an egg into a bowl and whisk until well blended, then measure out 1 Tbsp. Reserve remainder in refrigerator for another use.
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