In the meanwhile, in a large bowl, add beans and mash with a masher until coarse puree with some bean chunks forms. It doesn't have to be smooth, in fact coarser texture means "meatier" burger.
Add eggs, zucchini, onion, garlic, oat flour, rice, salt, cumin, pepper in adobo, and mix with spatula very well.
Preheat large non-stick ceramic or well-seasoned cast iron skillet on low - medium heat and swirl 1-2 tbsp of oil to coat it generously.
Scoop 1/2 cup for smaller or 3/4 cup mixture for larger burgers and form into a patty. Place on a skillet and proceed doing the same with remaining mixture until skillet is full.
Cook patties undisturbed for 5-7 minutes per side. Flip with flat spatula carefully with a quick single flip. Other side will cook faster as skillet gets hotter.
Optional: Top desired amount of patties with a bit of melted cheese, cover and cook on low until cheese is melted.
Assemble burger on a bun with your favorite toppings. Serve immediately.
Notes
Store: Refrigerate cooked patties in an airtight container for up to 5 days.
Freeze: Cook, cool and store in airtight container up to 3 months.
Meal prep: Lay patties on a baking sheet lined with parchment paper, freeze completely and transfer to a large Ziploc bag. Cook from frozen following recipe's instructions + 5 minutes.
Sub chipotle in adobo sauce with 1 tsp smoked paprika.
Grill for 7 - 9 minutes each side on a grilling mat or foil sprayed with cooking spray.
Bake in oven at 400 degrees for 20-25 minutes, flipping halfway through.