Using a skillet over medium heat add olive oil and turkey. Cook until evenly browned. Drain excess oil.: From the first sizzle you will notice the kitchen aroma shift toward roasted meat and warm spices, which is a good sign the Maillard reaction is happening and flavor is building. As the turkey browns, listen for a steady moderate sizzle, and watch the color change from pink to golden flecks, with juices running clear. Browning creates small browned bits on the pan, these are flavor gold and will deepen the chili when transferred. If the pan smokes or the oil darkens, reduce the heat to avoid bitterness. A common mistake is overcrowding the skillet, which causes steaming instead of searing; brown in batches if necessary to keep pieces separate. After browning, tilt the pan slightly and spoon off pooled fat, leaving just enough to carry flavor, especially if the turkey is not very lean.
Spray the crock pot with cooking spray and add the browned turkey, tomatoes, beans, corn and green chilies. Stir in the water and seasonings.: When you assemble the pot, the aromas combine and you should notice the bright tomato scent mingling with toasted spice notes. Stirring ensures the chili powder and ground cumin disperse evenly through the liquid, preventing clumps and creating a consistent color and flavor. The visual cue to aim for is an even distribution of beans, meat and vegetables in a slightly saucy matrix, not a dry pile. If some ingredients float, gently press them down so they are immersed for even cooking. A frequent error is adding too little liquid, which can cause scorching on the sides; the specified 3 quarter cup of water keeps things saucy without diluting flavor. Taste is not yet final, but check that the seasonings look blended and the mixture moves freely when you tilt the pot.
Cover and cook on Low for 8 hours or High for 4 hours.: As the crock pot works, the kitchen will gradually fill with a rich, slowcooked perfume, and the chili will take on a deep, melded flavor. On Low , you will notice subtle bubbling and a gentle steam, signaling a long, slow integration of flavors that yields a tender texture and richer complexity. On High , the bubbling is more vigorous and the finish will be ready sooner, though the flavor may be slightly less rounded. A good visual test is that the beans are tender without collapsing, and the sauce has thickened to coat a spoon. One pitfall is removing the lid too often, which releases heat and lengthens cooking time, so resist peeking unless necessary. If you find the chili too thin at the end, remove the lid and cook on High for a short period to reduce; if too thick, stir in a splash of hot water. Make sure to use oven mitts when handling the pot, as surfaces and steam will be hot.