This recipe serves two. To double it, I simply use two skillets (because catfish fillets are usually quite big) and double the amounts of everything.
2 catfish fillets
Salt and pepper, as needed
1 TBSP blackened/blackening seasoning (such as Zatarain’s or Chef Paul’s; see note)
2 TBSP olive oil
2 TBSP butter
2 shallots (or 1 cup diced onion)
2 garlic cloves, minced or grated
1 summer squash, sliced into thin medallions (yellow)
 1 zucchini, sliced into thin medallions
Fresh chopped herbs for garnish, such as basil, thyme and parsley (optional)
NOTE: to make your own simple blackening seasoning, combine equal parts smoked paprika, chili powder, garlic powder, dried oregano, and onion powder. Add cayenne pepper to taste (as spicy as you like).
Keywords: Blackened Garlic Butter Catfish with Summer Squash