Directions

• Step 1:
  Preheat the oven to 375 degrees F (190 degrees C). Grease 16 muffin cups, or line with paper muffin liners.
• Step 2:
  Beat butter and sugar in a large bowl until light and fluffy, about 3 minutes. Stir in eggs until well mixed. Add vegetable oil, stir to combine. Whisk sour cream, milk, and lemon zest into butter mixture until smooth.
• Step 3:
  Whisk flour, baking powder, baking soda, and salt in a small bowl.
• Step 4:
  Stir half the flour mixture into the butter mixture until combined. Add remaining half of flour mixture and blueberries into the batter, folding together until just combined.
• Step 5:
  Spoon batter into prepared muffin cups.
• Step 6:
  Place muffin cups on center rack of the preheated oven and bake until tops are golden and a toothpick inserted into the center of a muffin comes out clean, about 30 minutes.