Preheat oven to 350°F Grease or line a 12-cup muffin tray with paper liners.
In a large bowl, combine first 7 ingredients. In a smaller bowl, whisk together orange juice, liquid eggs and oil; pour over dry ingredients; Stir together just until moistened.
Spoon half of the batter evenly into the muffin cups (about 1/3 full). Drop 1 teaspoons of jam in center of batter in each muffin cup. Top evenly with remaining batter and place a final 1/2 teaspoons jam on top of each muffin. With a knife, drag the tip from center outward in a circular motion to create a marbled effect.
Bake for 20 minutes or until tops are firm to the touch. Remove from oven and cool for 10 minutes before removing from tray.