Mix rolled oats, steel-cut oats, rice cereal, dried fruit, and almonds together in a large bowl.
Melt butter in a saucepan over medium heat; add brown sugar, honey, and vanilla. Whisk until sugar is completely dissolved, about 2 minutes. Pour over oat mixture; stir to combine.
Spread oat mixture into the prepared baking dish. Press chocolate chips into the top. Refrigerate until chilled, about 1 hour.