These Lemon-Raspberry Oatmeal Crumb Bars are a delightful combination of tangy lemon and sweet raspberry flavors. The buttery oatmeal crumb crust and topping add a delicious crunch to the soft and gooey raspberry filling. These bars are perfect for breakfast, brunch, or as a sweet treat any time of the day. They are easy to make and can be stored in an airtight container for up to 3 days.