Sautéed Yellow Squash and Zucchini

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1 1/2 tablespoons olive oil

1 tablespoon unsalted butter 

1 yellow onion, thinly sliced into half moons 

2 cloves garlic, minced 

2 medium zucchini, sliced into 1/4-inch-thick rounds 

2 medium yellow squash, sliced into 1/4-inch-thick rounds 

1 teaspoon Italian seasoning 

Kosher salt 

Freshly ground black pepper