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Export 9 ingredients for grocery delivery
Step 1
Preheat oven to 375F (190C) and line 18 muffin cups with cupcake liners (or lightly grease and flour).
Step 2
In large bowl, whisk together oil, sugar, and milk. Stir in eggs and vanilla until well-combined.
Step 3
Gently fold in sour cream until just-combined.
Step 4
In separate, medium-sized bowl, whisk together flour, cocoa powder, baking soda, and salt.
Step 5
Fold flour mixture gently into wet mixture, folding until just barely combined. Stir in 1 ½ cup chocolate chips.
Step 6
Scoop chocolate muffin batter into prepared muffin tin, filling ⅔-¾ of the way full.
Step 7
Sprinkle tops of muffins with remaining chocolate chips.
Step 8
Bake on 375F (190C) for 18 minutes (toothpick inserted in center should come out with few slightly fudgy crumbs).