In a small bowl, combine oatmeal, flour, brown sugar, cinnamon & salt. With a pastry blender, cut in butter until mixture resembles coarse crumbs. Add pepita seeds, mix & set aside.
Muffin Tops
Preheat oven to 350 F. Spray a MUFFIN TOP PAN or line with paper cups. (This recipe makes 10 muffin tops the size shown in the blog picture). Set aside.
In a large bowl, whisk together flour, baking powder, baking soda, salt & spices. Set aside.
In a medium bowl, whisk the brown sugar & eggs together; add sweet potatoes, oil, milk & orange zest (or vanilla) & whisk again. Pour the wet ingredients into the dry ingredients & stir until JUST combined. Do not overmix the batter.
Scoop batter into muffin top pan; Sprinkle with streusel topping.
Bake for 10-12 minutes or until a toothpick inserted in the center comes out clean. Cool on wire rack.