In a small saucepan heat the oil and butter over medium-low heat and add the onion, garlic and red pepper. Cook, stirring often, about 5 minutes.
Sprinkle the flour over the veggies and cook 2-3 more minutes, stirring often.
Slowly whisk in the milk and mustard. Turn the heat up to medium-high and bring to a simmer. Simmer 3 minutes stirring often.
Turn the heat down to low and stir in the cheddar a little bit at a time followed by the Parmesan cheese.
Season with about ½ teaspoon salt and ⅛ teaspoon black pepper or to taste.
Remove from heat and stir in the broccoli.
Use a ladle to fill each cup with the broccoli mixture almost to the top.
Bake 18 minutes. Let them set up 10 minutes before removing from the pan.
Run the point of a paring knife around the edges of each one and lift them out by the edges of the tortillas.