Step 1

Preheat oven to 400°F. Line a 12-cup muffin pan with paper, foil or silicone liners.

Step 2

In a large bowl, whisk together flour, oats, baking powder, sugar and salt.

Step 3

In a medium bowl, whisk together milk, oil and mustard until well blended. Stir in broccoli, green onions and cheese (if using).

Step 4

Add the broccoli mixture to the flour mixture and stir until just blended.

Step 5

Divide batter equally among prepared muffin cups.

Step 6

Bake in preheated oven for 18 to 22 minutes or until a toothpick inserted in the center comes out clean. Let cool in pan on a wire rack for 5 minutes, then transfer to the rack. Serve warm or let cool.