These Fabulous Five Ingredient Raspberry Bars are a delightful dessert with a buttery shortbread crust, sweet raspberry jam, and a crumbly topping. They're simple to make yet full of flavor, perfect for any occasion.
1 cup unsalted butter, softened to room temperature
2 1/4 cups all-purpose flour
1 cup granulated sugar
1 egg, room temperature
1 jar seedless raspberry jam (9-12 ounce jar)