Preheat the oven to 350° F.
Line cookie sheet with parchment paper.
Beat butter and sugar in a mixer.
Add eggs and vanilla.
Add dry ingredients to combine.
Add sprinkles last.
Scoop large cookie mounds (3-4 ounces) onto the cookie sheet and bake 12-15 mins.
Cool on sheet and when only just a drop warm, inject the cookies with the strawberry jam using a piping bag. (I injected a small amount in 2-3 different places)