Preheat oven to 425 degrees. Lightly grease donut pans with non stick cooking spray.

Prepare the glaze. Combine 1 cup small diced strawberries with 2 tablespoons sugar. Stir and mash with fork, letting sit at room temperature until strawberry juice is produced. Then add 2-3 tablespoons of this strawberry juice mixture to confectioners sugar and mix well. If glaze seems to runny or to thick, add more strawberry juice or confectioners sugar until desired consistency. Set aside.

Prepare the donut batter. In a large bowl combine flour, sugar, baking powder, and salt. Stir to combine.

In another bowl combine the melted butter, eggs, buttermilk, vanilla, and strawberry jam.

Add the wet ingredients to the dry ingredients. Mix just until combined, then fold in the diced strawberries. Carefully spoon mixture evenly into doughnut pans, filling about 3/4 full. You should have enough batter for 12 donuts.

Bake for 8 to 10 minutes or until toothpick inserted comes out clean.

Cool on a wire rack. Once cooled, dip each donut into glaze and return to wire rack. Sprinkle generously with Fruity Pebbles cereal.