Preheat the oven to 350 degrees F. Toss the graham cereal and pretzel sticks together in a large bowl. Whisk the butter, brown sugar, vanilla and cinnamon in a separate bowl. Pour the sauce over the snack mix and toss to coat well. Spread out on a rimmed baking sheet and bake until the mix is toasted and almost completely dry, 10 to 15 minutes, tossing about halfway through.
Remove from the oven and let cool completely. Toss in the yogurt-covered pretzels and strawberries. Store in an airtight container for up to 3 days.
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