Adapted from joyofbaking.com

Oatmeal Base:
1/2 cup unsalted butter, room temperature
1 cup light brown sugar
1 large egg
1 teaspoon pure vanilla extract
1 1/4 cups wheat flour
1/2 teaspoon baking soda
1/4 teaspoon salt
2 cups rolled oats, divided
Filling:
1 cup
raspber...
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