Raspberry And Jam Muffins

Name: Raspberry And Jam Muffins
Ingredients: 6 Tablespoons unsalted butter; 1/3 cup whole milk; 1 large egg; 1 large egg yolk; 3/4 teaspoon vanilla extract; 1 1/2 cups all-purpose flour; 3/4 cups sugar; 1 1/2 teaspoons baking powder; 3/4 teaspoon salt; 1/2- 1 cup frozen or fresh raspberries (or whatever berry you might have in your freezer or fridge, use as much of the bag or as little as you have left); 3 Tablespoons strawberry jam (or whatever fruit jam you have on hand); 3 Tablespoons cold unsalted butter, cut into 1/2-inch cubes; 1/2 cup all-purpose flour; 3 1/2 tablespoons sugar