01 -
Spray slow cooker with nonstick cooking spray.
02 -
Add frozen green beans to slow cooker.
03 -
In skillet over medium-high heat, sauté bacon until lightly browned (around 3-5 minutes).
04 -
Add shallots to skillet and sauté for another 1-2 minutes until they just start to brown.
05 -
Add minced garlic and cook for 1 more minute.
06 -
Add flour evenly to pan, and stir the sauce to coat bacon, shallots, and garlic.
07 -
Slowly add chicken broth while stirring until smooth.
08 -
Let mixture simmer for about 4-6 minutes until sauce thickens enough to stick to a spoon.
09 -
Add cream and seasonings and let mixture continue to simmer for another 3-4 minutes until it is thick and heated through.
10 -
Pour sauce over green beans in slow cooker and toss lightly to evenly coat them.
11 -
Sprinkle green beans with cheese, cover, and cook on high for 2 ½ to 3 hours or low for 5 to 6 hours.
12 -
About 15 minutes before serving, sprinkle French-fried onions across top of casserole and let it heat on high until lightly crispy.