preheat oven to 425 degrees
butter pan, butter well. Or use jumbo muffin liners
in a large bowl, weigh your flour using a scale. Weigh to 375g. If you do not have a scale, try to fluff up your flour and spoon it to a measuring cup. Pass a knife along top to get rid off excess flour along the top of your cup and measure out 3 cups.
add baking powder, baking soda, and salt, whisk and set aside
in another bowl, pour oil, sugar and eggs and beat until well combined
add yogurt, buttermilk and vanilla extract and beat until well combined
add wet ingredients to dry ingredients and either beat it slightly or mix it with a spatula where it is not fully combined and you still see flour. Fold in the chocolate chips until just combined and you don't see flour.
this batter is very thick, you have to spoon out the batter into the muffin tin. Spoon out so that the batter in each cavity is full all the way to the top. See video.
bake at 425 degrees for 5 minutes. After 5 minutes, decrease the heat to 350 degrees and bake for 2025 minutes or until the top is golden brown and a toothpick or knife inserted comes out clean.
baking this way, by starting out at high heat and lowering the heat to continue baking, ensures that you get that bakery style muffin top that extends high.
store muffins at room temp for up to 3 days.