Crock Pot Green Bean Casserole



3 Tablespoons unsalted butter
1 pound white button mushrooms, wiped clean, sliced or broken into pieces
3 cloves garlic, minced
Salt and freshly ground black pepper
3 Tablespoons flour
1 ½ cups low-sodium chicken broth
1 ½ cups heavy cream
2 (12 ounce) packages of frozen cut green beans (see notes)
3 cups canned fried onions
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