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Preheat the oven to 375°
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Line a rimmed half cookie sheet (13x18x1) with parchment paper, or spray with nonstick spray.
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Combine In a bowl the baking powder, salt, flour, and old-fashioned oats, set aside.
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In the bowl of your mixer or a large mixing bowl, mix together the peanut butter and butter.
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Add in the sugar and brown sugar and cream together till smooth and light, about 5 minutes. If creaming by hand, use a large whisk and beat until light and fluffy.
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Add in the eggs and vanilla and beat to combine.
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Add the oat flour mixture to the wet ingredients and stir to combine.
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Press the peanut butter base into the cookie sheet, spreading evenly to the edges. The dough is pretty sticky, so spray your hands or a rubber spatula with nonstick spray while you spread it.
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Bake in the preheated oven for 15-25 minutes until the middle is just barely set. Keep a close eye on it as you don’t want the base to overcook. It will continue to cook for a bit after removing the base from the oven.
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Allow the cookie base to cool for about 5 minutes, then drop peanut butter dollops over the top of the base.
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Allow to sit for about 1-2 minutes until the peanut butter starts to soften, then spread peanut butter evenly over the top.