Blueberry muffins with jam

Recipe adapted from American test kitchen,..
Blueberry muffin recipe
(make 8standard size muffins):
1 1/4 cup flour
1 1/4tsp baking powder
1/2tsp salt
1egg
1/2cup packed brown sugar
1/2cup buttermilk
1/4cup veg oil
1tsp vanilla
1/2cup fresh blueberries
Jam
1) in a bowl, mix together flour, baking powder and salt. In another bowl, mix together egg and sugar, add in milk, oil and vanilla.
2) Pour wet mixture into the flour mixture, stir in blueberries until just combined.
** (Batter would be lumpy, don't try to over mix and create a smooth batter!)
3) divide batter into muffin tin, top with jam and create a swirl pattern
4) bake in 425F preheated oven for 5mins, reduce temperature to 375F for 10to12mins or until a toothpick comes out clean :)

- this recipe resulted in a more cake like muffin,very soft and moist. personally, I would prefer a denser type muffin