Combine the Cheesy Base: Start by mixing the shredded sharp cheddar and Monterey Jack cheeses in a large bowl. Toss in the diced pickled jalapeños, making sure the ingredients are evenly distributed.
Prepare the Wet Mixture: In a separate bowl, whisk together the evaporated milk, flour, and eggs until you have a smooth, lump-free batter.
Bring It All Together: Pour the wet mixture into the cheese mixture, stirring well to combine. You’ll want everything evenly coated for consistent flavor in every bite.
Spread and Bake: Grease a 9×13-inch baking dish, then spread the mixture out evenly. Bake in a preheated 350°F oven for 35-40 minutes, or until the top is golden brown and bubbling.
Cool and Serve: Let the baked squares cool for about 10 minutes to set. Then, cut into squares and serve warm.
