To prepare cream, combine the first 4 ingredients in a bowl, stirring well. Cover and chill.
Preheat oven to 40
To prepare tart, heat a 10-inch cast-iron skillet over medium-high heat. Coat pan with cooking spray.
Add onion to pan; saut 5 minutes.
Add chile to pan; saut 5 minutes.
Remove casings from sausage.
Add sausage to pan; saut 2 minutes, stirring to crumble.
Add corn and garlic to pan; saut 5 minutes or until lightly browned.
Remove corn mixture from pan.
Wipe pan dry with a paper towel. Recoat pan with cooking spray, and set pan aside.
Combine 2 cups water and salt in a saucepan over medium-high heat; bring to a boil. Gradually stir in the polenta; cook 5 minutes or until thick, stirring constantly.
Remove from heat, and stir in 1 1/2 cups corn mixture.
Pour polenta mixture into prepared pan.
Sprinkle 1/4 cup cheese evenly over polenta mixture; top with remaining corn mixture.
Sprinkle remaining 1/4 cup cheese over top.
Bake at 400 for 25 minutes or until lightly browned.