Step 1:
Preheat oven to 350°F (180°C).
Step 2:
In a large bowl, whisk together flour, cream of tartar, cinnamon, and baking soda until well mixed.
Step 3:
Melt butter in a 12-inch cast-iron skillet over medium heat until just melted. Remove from heat and stir in sugar. Stir in one egg at a time until emulsified. Stir in vanilla.
Step 4:
Add the flour mixture to the skillet and stir until well mixed. Stir in dark chocolate, pecans, peanut butter cups, and caramels. Sprinkle with cinnamon-sugar.
Step 5:
Bake for 20 to 25 minutes or until the edges are golden brown and the center is set. Let cool in the pan for 15 minutes.
Step 6:
Sprinkle with flaked salt to taste. Cut into wedges and serve warm with ice cream.
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