Preheat oven to 375 degrees F. Spray two ramekins with low fat cooking spray.
Break up broccoli and divide tofu into 1" cubes and divide into ramekins.
Melt butter in nonstick pan over medium heat. Cook onions until soft. Add flour, constantly stirring, add vegetable stock and milk. Continue stirring until sauce thickens and turns light brown. Add salt and pepper to taste. Spoon sauce over tofu and broccoli, top with cheese and bake for 20 minutes.