Slow Cooker Layered Ratatouille

2 onions, peeled and sliced in 1/2 inch rings
1 eggplant, washed and sliced in 1/2 inch rings
4 zucchini, washed and sliced in 1/2 inch rings
2 garlic cloves, minced
2 green bell peppers, cut in 1/2 inch strips
6 large ripe tomatoes, cut in 1/2 inch thick wedges
1 tsp dried basil
2 tsp salt
1/4 tsp black pepper
2 Tbsp fresh flat leaf parsley, chopped
1/4 cup olive oil

Get out your crockpot.
Put half the vegetables in the crockpot in the order listed: onion, eggplant, zucchini, garlic, green bell peppers, and tomatoes.
Repeat the same layers.
Evenly sprinkle the basil, salt, pepper, and parsley over the top, then drizzle the olive oil evenly over all.
Cover and cook on LOW for 7 to 8 hours or until all vegetables are very tender.
You have several options for serving. 
Spoon it directly out of the crockpot, hot, as a side dish, being careful to maintain the layers to show off how pretty they are.
Remove to a large bowl and chop it up into a coarse texture and serve as a side or a spread.
Or put the mixture in a food processor and pulse it until you get a finer texture and serve as a dip or spread.