Preheat the oven to 350 degrees .
Line cupcake tins with cupcake papers.
In a large bowl, cream together the butter, jam and sugar for 3 minutes.
Beat in eggs one at a time.
Add vanilla to milk, combine the flour, dry strawberry gelatin and baking powder in a separate bowl; stir flour mixture into the batter alternately with the milk and vanilla.
Scoop into lined cupcake tins
Bake for 18 to 22 minutes in the preheated oven, or until a small knife inserted into the center of a cupcake comes out clean.
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Place sugar, salt and butter in the bowl of a stand mixer and beat on low speed until well blended. Increase speed to medium and beat for another 4 minutes or until smooth.
Add vanilla and cream. Beat on medium speed for about 1 minute. I needed, beat in more cream 1 tablespoon at a time to achieve the consistency that you like.