I found this recipe at least 15 years ago. My family and friends have always loved it. I used to do the broccoli from scratch, but recently started using frozen broccoli. It tastes the same. This is a great holiday side. The red pepper is what makes this dish...and the scratch sauce. Use a whisk for the sauce, it makes it very smooth and creamy. I usually use half and half, but the cream makes it go over the moon. Enjoy.
Heat oven to 350 degrees. Butter a 9 x 13 baking dish. Bring 3 quarts of water to a boil. Cook broccoli 3 - 5 min or just till tender crisp, or set frozen broccoli in a colander and run water to thaw. Drain and place in large bowl.
Melt butter in a 12" skillet over medium heat and cook onion and red pepper 3 min, stirring occasionally. until vegetables are crisp tender. Remove to broccoli bowl with a slotted spoon. Add flour to pan. Cook 1 - 2 minutes, until blended. Gradually stir in cream or half & half. Cook and stir till mixture thickens and comes to a boil, about 2 min. Remove from heat and add 1 1/2 cups cheese and salt/pepper. Pour over vegetables and toss to coat well. Spoon mixture into prepared baking dish. Top with 1/2 cup of cheese.
Bake 15 - 20 minutes until mixture is hot and bubbly. Makes 6 - 8 servings.