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Preheat oven to 375ºF/190ºC. Spray 12 muffin cups with nonstick cooking spray or line with muffin liners. Set aside.
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In a large bowl mix together flour, baking powder, and salt. Add eggs, oil, sugar, peanut butter, milk, and vanilla extract. Using a hand mixer or a standing mixer fitted with the whisk attachment, whisk ingredients on low-medium speed just until combined.
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Fill muffin cups halfway with batter. Make a small well in the center of each muffin with the back of a teaspoon and spoon in 1-2 teaspoons jam. Divide remaining batter between muffin cups. Bake for 15-20 minutes or until a toothpick inserted into the center of a muffin come out clean. Remove from oven. Allow to cool in pan for 5 minutes, then transfer to a wire rack to cool completely.
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Muffins are best the same day they are made, but can be kept in an airtight container, at room temperature or in the fridge, for up to 3 days. For jumbo muffins: Fill muffin cups about ¾ full and bake for 22-27 minutes or until a toothpick comes out clean. Yield: 5-6 muffins.