This is a wonderful way to take advantage of sweet, fresh seasonal berries. It is actually pretty quick, too. You can throw it together and pop it in the oven while having dinner. By the time you're finished your meal, dessert will be served.
Heat oven to 375 degrees. Butter 8-inch round cake pan or pie plate.
Mix 2 T. flour, the granulated sugar, lemon juice, and 1/4 t. nutmeg in mixing bowl. Add berries and toss gently to combine. Transfer to buttered pan.
Place remaining 1/2 cup flour, the oatmeal, brown sugar, and remaining 1/4 t. nutmeg in food processor; process to blend. With machine running, add butter a few pieces at a time. Spoon mixture over berries.
Bake until top is golden, about 30 minutes. Let cool slightly. Serve warm with whipped cream.