In a small bowl, whisk together the olive oil, ranch dressing mix, dried dill, and garlic powder until fully combined. The mixture should look thick and slightly grainy from the seasoning packet. This only takes about a minute to pull together.
Pour your cheddar crackers into a large mixing bowl, then drizzle the seasoned oil over the top. Toss everything gently but thoroughly, making sure every cracker gets an even coating. I like to use my hands here since a spoon tends to miss spots.
Divide the coated crackers between two large rimmed baking sheets, spreading them out into a single even layer. Bake at 300°F for about 30 minutes, stirring every 10 minutes so they toast evenly on all sides.
Once golden and fragrant, pull the sheets out of the oven and let the crackers cool right on the pans for about 30 minutes. This resting time is what makes them crisp up properly instead of staying soft.
Once fully cooled, move your crackers into an airtight container or a large zip-top bag. They're ready to snack on immediately, or you can save them for later get-togethers.