Blackberry Yogurt Muffins

Name: Blackberry Yogurt Muffins
Ingredients: 1/4 cup rolled oats; 1/3 cup granulated sugar (if you want a deeper color, use a combination of granulated and light brown sugar); 1/3 cup all-purpose flour; 1 1/4 teaspoons ground cinnamon; 1/4 cup cold unsalted butter (grated or cut into small cubes); 1 1/2 cups all-purpose flour; 1/2 cup granulated sugar; 2 teaspoons baking powder; 1/2 teaspoon kosher salt; 1/4 cup olive oil; 1 large egg; 1/2 cup plain unsweetened Greek yogurt; 1 teaspoon vanilla; 1 cup fresh blackberries (halve the berries if they are big)