Mix almond flour, coconut flour, sweetener, salt, baking powder, and cinnamon together in a bowl. Whisk in eggs, heavy cream, butter, and vanilla extract slowly until batter is just blended.
Heat a lightly oiled griddle over medium-high heat. Drop batter by large spoonfuls onto the griddle and cook until bubbles form and the edges are dry, 3 to 4 minutes. Flip and cook until browned on the other side, 2 to 3 minutes. Repeat with remaining batter.
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