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1
Position rack in the center of the oven; preheat to 375F.
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2
Line a large baking sheet with parchment paper or a silicone baking mat.
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3
Whisk all-purpose flour, whole-wheat flour, baking soda and salt in a medium bowl until well combined.
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4
Grind walnuts in a food processor until they resemble coarse meal.
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5
Beat butter, oil, granulated sugar and brown sugar in a large bowl with an electric mixer until almost creamythe mixture may still be a little grainy.
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6
Beat in egg and vanilla; scrape down the sides and beat in melted chocolate and the ground nuts.
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7
Stir in the dry ingredients with a wooden spoon until just incorporated.
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8
Roll 1 tablespoon dough into a ball, place on the prepared baking sheet and flatten slightly until it looks like a deflated basketball.
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9
Continue with the remaining dough, spacing the cookies 2 inches apart.
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10
Bake the cookies for 6 minutes.
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11
Remove from the oven and gently press your thumb or the end of a wooden spoon in the center of each cookie.
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12
Place 1/2 teaspoon jam in each indentation.
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13
Bake until the jam is melted and the cookie is set but still a little soft, 8 to 10 minutes more.
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14
Cool on the pan for 2 minutes, then transfer to a wire rack to cool completely.
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15
Let the pan cool for a few minutes before baking another batch.
