Preheat oven to 375 degrees F (190 degrees C). Spray 2 mini muffin tins with cooking spray.
Mix milk and vinegar together in a bowl; let stand until milk curdles, about 5 minutes. Beat in oil and egg.
Combine flour, sugar, baking powder, baking soda, and salt in a bowl; stir into milk mixture until smooth. Spoon batter into the prepared muffin tins with a tablespoon or a small batter scoop.
Bake in the preheated oven until batter is risen and still pale, about 8 minutes. Remove from muffin cups with a silicone scraper.
Buttermilk can be substituted for the milk and vinegar if desired.
These baked in 8 to 9 minutes in one of my ovens but took only 7 to 8 minutes in the other one, so just watch them.
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