Preheat the oven to 350F. Grease and flour a ring mold baking pan.
Mix together the dry ingredients and set aside.
Beat together the butter and sugar until light and fluffy.
Add in the eggs and vanilla, then beat well.
Mix together the yogurt and buttermilk in a small bowl.
Add in one-third of the flour mixture and gently mix in. Add in half the yogurt mixture and mix in. Add in half the remaining flour and mix, then the remaining yogurt mixture. Fold in the last of the flour mixture.
Pour in the batter into the mold. Top the batter with the strawberry jam making sure the jam doesn't touch the edges.
Bake for 35 - 40 minutes, or until a toothpick inserted comes out clean.
Allow to rest for 20 minutes, then remove the cake and transfer to the wire rack to cool completely.
Make the icing by beating together the ingredients together until well-combined.
Drizzle over cooled cake, then top with sprinkles.