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Cream together the butter, brown sugar, and granulated sugar in a large mixing bowl on medium speed until thoroughly creamed together.
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Add in the eggs one at a time until they are mixed it.
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Bring the mixing speed down to low, add in the vanilla extract, ground cinnamon, ground nutmeg, and salt. Mix together.
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/2 cup at a time while mixing on medium speed, add in the flour.
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Using a spatula, fold in the oats and and chopped up chocolate bar.
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Cover with plastic wrap and refrigerate for at least 3 hours. Overnight is best.**
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Preheat oven to 350 degrees and line a baking sheet with parchment paper or a silicone baking sheet.
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Spoon the cookie dough onto the sheet and bake for 9-10 minutes.
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Allow to cool for 1-2 minutes before transferring to a cooling rack