Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.

In a large bowl, cream together softened butter and granulated sugar until light and fluffy.

Mix in vanilla extract, then gradually add flour and salt until a dough forms.

Roll out the dough on a floured surface to about 1/4 inch thickness. Use a heart-shaped cookie cutter to cut out shapes.

Place cookies on the prepared baking sheet and bake for 10-12 minutes, or until edges are lightly golden. Let cool completely.

For the glaze, whisk together powdered sugar, strawberry jam, and milk until smooth. Add a drop of red food coloring if desired.

Dip the top of each cookie into the glaze or drizzle it over the top. Add sprinkles if using.

Allow glaze to set before serving. Store in an airtight container for up to 5 days.