Heat the cooking oil in a skillet or griddle over medium heat while you mix the ingredients. The skillet should be about 375°. You can check the temperature using a digital thermometer.
Add the vegetable oil, milk, lemon juice, and vanilla to a measuring cup, or a small bowl, gently stirring, and letting sit while you assemble the dry ingredients.
In a medium bowl add the flour, baking powder, and sugar. Use a whisk to mix together. If using cinnamon add now.
Add the wet ingredients to the dry and stir until there are no more dry spots. Gently fold in the blueberry jammy bits.
Pour 1/2 for two large pancakes or 1/3 of the batter for three pancakes onto the hot griddle or large skillet. Transferring the batter to a measuring cup makes it easy to get the right amount of batter onto the griddle.
Notes
Spoon the flour into the measuring cup.
Cook the pancakes on medium heat. If you cook them on too high of a heat, they will be burnt on the outside but not cooked through in the middle.
Flip them at the right time. Don’t flip the pancakes until they are ready – when they start to form small bubbles on the surface, they are ready to flip.