I also have a 6 quart crock pot and this is my favorite recipe. All you need is the crock-pot, a can opener, a spoon and a knife.
Mom's Rainy Day Chili (none of this has to be exact and it all turns out delicious)
2 lb hamburger (crumble into pot raw)
1 huge can dark red kidney beans (I think it's 44oz or something like that)
1 lg can diced tomatos
1 very small can chopped chilis (found in the mexican food aisle)
1 reg can tomato sauce
1 reg can tomato paste
1/2 cup water
1/2 green bell pepper (diced)
3-4 slices white onion (diced)
2-3 tbsp. minced garlic (my grocery store sells jars of pre-minced garlic, makes it super easy, I just use a regular spoon to measure)
salt, pepper, seasoning salt, dried crushed red pepper (from the spice aisle), chili powder (all to taste, just go easy on the chili powder and crushed peppers if your kids don't like spicy food)
Put everything into the crock pot, stir until appropriately uniform and cook at HIGH for 4 hours or LOW for 8 hours, or until meat is cooked and onions/peppers are tender. Serve however you like chili. (I serve it on hot dogs, mixed with macaroni noodles, mixed with rice or plain with sour cream and shredded cheese.)
This recipe feeds my family of four for three to four days, lunch and dinner, depending on how I'm using it.
You also might want to consider picking up a rice cooker/ veggie steamer, the kind that you can use for rice and veggies at the same time. They work great and really cut down on stove top prep. You can even cook a healthy, whole meal (other than chili, which is a whole meal by itself) with just these two appliances (the crock pot and steamer), think a pot roast with a rice and veggie jumble on the side.
Best of luck and I hope you get a lot of great suggestions.