Preheat oven to 350 degrees.
Cook pasta according to package instructions. Set aside.
In a large saucepan, heat oil over medium heat. Add onion and cook until softened (about 5 to 7 minutes). Add garlic and saute for 1 minute. Add flour and cook, stirring constantly, until lightly toasted (about 1 minute).
Gradually add milk, paprika, mustard, salt and pepper, whisking constantly. Bring to a boil, and then cook until thickened (about 2 to 3 minutes).
Add cheeses to milk mixture, stirring until melted and then remove from heat.
Add broccoli and cooked pasta to the cheese sauce, stirring until well-blended.
Pour into a 2-quart baking dish coated with cooking spray. Sprinkle with breadcrumbs.
Bake uncovered for 15 minutes, or until bubbly.
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