Mix Dry Ingredients: In a large mixing bowl, whisk together the flour, sugar, baking powder, and salt.
Prepare the Wet Ingredients: In a small bowl or measuring cup, combine the plant-based milk and apple cider vinegar (or lemon juice). Let it sit for about 5 minutes. This will create a "buttermilk" effect, helping the pancakes become extra fluffy.
Combine Wet and Dry Ingredients: After the "buttermilk" mixture has sat for 5 minutes, add the vegetable oil and vanilla extract to it. Pour the wet ingredients into the dry ingredients and gently mix until just combined. Be careful not to overmix; it's okay if there are a few lumps.
Heat the Pan: Preheat a non-stick skillet or griddle over medium heat. Lightly grease the pan with a bit of oil if needed.
Cook the Pancakes: Pour about 1/4 cup of batter onto the skillet for each pancake. Cook until bubbles form on the surface and the edges start to look set, about 2-3 minutes. Flip the pancake and cook for another 2-3 minutes until golden brown and cooked through.
Serve: Serve the pancakes warm with your favorite toppings such as maple syrup, fresh fruit, vegan butter, or nut butter.