Recipe for caramelized onions is listed in the ingredients. This will take about 40 minutes total (which is included in the total time for this recipe), but it is very easy, I promise! And it is SO worth it!*
Cook the bacon until crispy. (I like to do this in a 375 F oven for about 20 minutes, which is perfect to do while you're making the onions!) Transfer the cooked bacon to a plate lined with paper towels to cool. Once the bacon is cool enough to handle, tear each strip into thirds so it can easily fit onto the slider buns.
Stir the mayonnaise and cracked black pepper together in a small bowl until fully combined.
In a bowl, toss the arugula with the extra virgin olive oil, and a little pinch of salt. Slice the tomatoes into 1/2" thick slices, and set aside.
build the BLT sliders ::
Cut the slider buns in half. Spread 1/2 tablespoon of pepper mayonnaise onto the bottom half and top half of each bun.
Place two slices of tomato onto the bottom bun. Layer on arugula, three pieces of bacon, a tablespoon of caramelized onions, and then the top bun.
*(If you don't have time to make caramelized onions, thinly sliced raw red or white onion will work!)