In a large bowl, add half of the black beans and mash well (a few chunks are fine).
3. Step
Add the mushrooms, broccoli, remaining black beans, red onion, garlic, dill, paprika, red pepper flakes, rosemary, salt, pepper, and liquid smoke.
4. Step
Mix thoroughly, then mash until the mixture is well-combined.
5. Step
Add the bread crumbs and eggs and mix until thoroughly combined.
6. Step
Grease a 13x18-inch (33x45 cm) baking sheet with olive oil.
7. Step
Transfer the veggie burger mixture to the pan. Using a spatula and your hands, form the mixture into a rectangle that is roughly the size of the slider buns.
8. Step
Bake for 40 minutes, or until firm and browned, flipping halfway through.
9. Step
Make the avocado dressing: add the avocado, jalapeño, Greek yogurt, garlic, lime juice, olive oil, salt, pepper, and water to a blender, and blend until smooth.
10. Step
Keeping the slider buns attached, cut in half lengthwise with a serrated knife. Remove the top half and set aside.
11. Step
When veggie burger is done baking, remove from oven and place on top of bottom half of slider buns.
12. Step
Spread the avocado dressing over the veggie burger, then top with the tomatoes and lettuce.
13. Step
Cover with the top slider buns, and cut into 12 sliders.
