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Export 11 ingredients for grocery delivery
Step 1
Heat oil in a Dutch oven over medium-high heat.
Step 2
Add in chopped onion, garlic, oregano and crushed red pepper flakes; saute for about 5-6 minutes.
Step 3
Add in tomatoes with juice and drained mushrooms along with black and green olives; simmer on low heat for about 25-30 minutes, or until mixture starts to thicken.
Step 4
Add in cooked pasta shells and 3/4 - 1 cup grated Parmesan cheese; toss to combine.
Step 5
Serve with more Parmesan cheese.