Gently combine the strawberries with 1/2 cup granulated sugar and 1/4 cup brown sugar. Let sit for 30 minutes, then drain excess liquid. Combine 3 1/2 tablespoons flour, nutmeg, cinnamon, and vanilla extract, and fold gently into the strawberries.
In a separate bowl, whisk together 1 cup flour, 1/2 cup sugar, baking powder, and salt. Mix the half-and-half with the melted butter, then combine with the dry ingredients to form a sticky dough.
Preheat the oven to 350°F. Place the strawberry mixture in a 9-inch square baking dish. Drop spoonfuls of dough over the strawberries.
Bake for 40 minutes or until the topping is golden and the strawberries are bubbling.
Serve warm, with a scoop of vanilla ice cream or a dollop of whipped cream.