Gather your ingredients. Preheat your oven to 400ยบ. Give your muffin tin a light spray of non-stick cooking spray.
Stir together your dry ingredients in a large bowl.
In a separate bowl, combine your melted butter with the egg, plain Greek yogurt and vanilla. Stir until blended.
Add the wet ingredients to the dry and stir just until combined. Do not over mix.
Fill each muffin cup halfway with batter. If using a heart-shaped pan, gently push the batter into the edges.
Using the back of a teaspoon, make a well in each muffin cup. Be sure to leave some batter at the bottom of the well, so your jam doesn't ooze out the bottom of the muffin.
Scoop about a teaspoon of jam into each well.
Bake the muffins for 13 minutes, or until golden brown. If your jam has breached the banks of the muffins, don't worry, they still taste great.
Enjoy warm, or store in an airtight container for up to a week.
