Preheat your oven to 350°F (175°C).
Line a jumbo muffin tin with paper liners.
In a large bowl, whisk together the flour, light brown sugar, baking powder, baking soda, and salt.
In another bowl, mix the creamy peanut butter, vegetable oil, plant-based milk, vanilla extract, and dairy-free yogurt until smooth.
Add the wet ingredients to the dry ingredients, mixing until just combined. Do not overmix.
Divide the batter evenly among the prepared muffin liners, filling each about two-thirds full.
Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 10 minutes, then transfer to a wire rack to cool completely.