Step 1

In a 6-qt. electric multicooker use sauté setting on high to melt butter. Add mushrooms; cook 6 minutes or until tender, stirring occasionally. Press cancel setting. Layer penne, caramelized onions, beef (if using), garlic, rosemary, crushed red pepper, 1/2 tsp. kosher salt, and 1/4 tsp. black pepper in the pot; do not stir. Pour broth over top. Lock lid and adjust steam valve to seal. Set cooker on low pressure to cook 7 minutes for al dente pasta or 8 minutes for tender pasta.

Step 2

Immediately release pressure. Carefully open lid. Stir in Parmesan, parsley, and vinegar. Fold in arugula. If you like, season with additional salt. Top with blue cheese and additional black pepper. Serves