Make the seasoned oil by mixing together olive oil, ranch seasoning, red pepper flakes, and kosher salt in a small bowl.
Add saltine crackers to a gallon-sized zip-top bag, pour in the oil mixture, seal the bag, and toss gently until the crackers are well-coated.
Let the crackers rest in the oil mixture for at least an hour before baking.
Preheat the oven to 300°F.
Spread the crackers into an even layer on a rimmed baking sheet lined with parchment paper.
Bake until fragrant and just beginning to brown, about 7 to 10 minutes.
Let them cool to room temperature before serving.
