Remove casings from sausage and saute sausage in a large pan. Breaking up pieces as it cooks. Cook for 5-7 minutes until cooked through. During the last minute of cooking add garlic. Remove from the heat, and transfer the sausage to a large bowl along with cooked penne noodles, and roasted red peppers.

Wipe down the pan you were using for the sausage with a paper towel. Then add the butter to pan and stir until melted. Add flour and stir again until mixed together. Gradually whisk in milk; then chicken broth.  Bring to boil, then lower heat until slightly thickened. (It will still be somewhat on the liquid side, but will thicken once it bakes)  Add onion powder, salt and pepper, and 1 cup cheddar cheese. Stir until cheese is melted and smooth.

Add sauce to bowl with sausage, peppers, and noodles and stir to combine. Transfer mixture to a casserole dish. Sprinkle remaining cheddar cheese over the top and bake for 10-15 minutes until cheese is melted and bubbly. Serve immediately.