Ginger Pecan Oatmeal Crisps

1 cup quick cooking oatmeal
3/4 cup pecan halves
1 cup whole-wheat flour
1/4 cup cornstarch
1 teaspoon ground ginger
1/2 teaspoon fine salt
1/4 teaspoon baking soda
3/4 cup (1 1/2 sticks, 6 ounces) unsalted butter, softened
3/4 cup granulated sugar
1/3 cup light brown sugar
1 teaspoon pure vanilla extract
1 large egg