Preheat the oven to 350°F and prepare a baking sheet with parchment paper.

Mix together the butter, brown sugar, and granulated sugar until incorporated. Mix in the egg and vanilla extract for about 3 minutes, or until the mixture is light and fluffy.

Incorporate the flour, oats, cinnamon, baking soda, and salt, scraping down the edges as needed. Stir in the chocolate, peanut butter, and toffee chips.

Scoop out 10 equal-sized cookie dough balls with a large cookie scooper, lay them on the prepared baking sheet, and bake for 11-12 minutes in a preheated oven. Make sure not to overbake them to keep them moist and gooey!