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Preheat the oven to 350 degrees F. Line baking sheets with parchment paper or sil-pat.
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In a medium bowl, add flour, baking soda, cinnamon, and salt. Whisk to combine. Set aside.
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In a large bowl, add butter, sugar, and brown sugar. Using an electric mixer on high speed, beat until light and fluffy, about 4 minutes. Scrape down bowl as needed.
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Add eggs, one at a time, beating well after each addition. Add vanilla and beat to combine.
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Add the oats and toffee bits and stir to combine. Drop rounded tablespoonfuls of dough on to baking sheets.
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Bake cookies for 9 to 11 minutes until light golden brown. Cool cookies on baking sheets for 2 to 3 minutes. These cookies are very soft. Carefully transfer cookies to a cooling rack and cool completely. Store in a sealed container at room temperature.