Wash and hull the strawberries and slice the peaches into thin wedges. In a large mixing bowl, combine strawberries, peaches, granulated sugar, lemon juice, and salt. Let sit for about 10 minutes.

In another bowl, mix rolled oats, flour, brown sugar, cinnamon, and a pinch of salt. Cut in the cold butter until the mixture resembles coarse crumbs.

Preheat oven to 350°F (175°C). Grease a baking dish. Pour the fruit filling into the dish and sprinkle the oat mixture evenly on top.

Bake for 35-40 minutes until golden brown and bubbly. Keep an eye on it as it bakes.

Cool for about 10 minutes before serving. Serve warm with ice cream or whipped cream if desired.